SKYH Sky Harbour Group Corporation

Sky Harbour Group Corporation (“SHG”) is a holding company organized under the laws of the State of Delaware and, through its main operating subsidiary, Sky Harbour LLC and its subsidiaries (collectively, “Sky”), is an aviation infrastructure development company that develops, leases and manages general aviation hangars for business aircraft across the United States. Sky Harbour Group Corporation and its consolidated subsidiaries are collectively referred to as the “Company.”

On January 25, 2022 (the “Closing Date”), our predecessor, Yellowstone Acquisition Company (“Yellowstone”), a special purpose acquisition company incorporated in Delaware on August 25, 2020, consummated the business combination (the “Yellowstone Transaction”) contemplated by the Equity Purchase Agreement, dated as of August 1, 2021 (the “Equity Purchase Agreement”), with Sky, a Delaware limited liability company.

As a result of the closing of the Yellowstone Transaction, and collectively with the other transaction described in the Equity Purchase Agreement, the Company was reorganized as an umbrella partnership-C corporation, or “Up-C”, structure in which substantially all of the operating assets of the Company are held by Sky and SHG’s only substantive assets are its equity interests in Sky (the “Common Units”). As of the Closing Date, SHG owned approximately 26.1% of the common units of Sky (the “Sky Common Units”), and the prior holders of Sky’s Existing Common Units (the “LLC Interests”) owned approximately 73.9% of the Sky Common Units and control the Company through their ownership of the Class B Common Stock, $0.0001 par value (“Class B Common Stock”) of the Company. As of June 30, 2022, the Company and the LLC Interests owned approximately 26.1% and 73.9% of Sky Common Units, respectively. See Notes 2 and 3 for additional discussion related to the Yellowstone Transaction.

Basis of Presentation

The accompanying unaudited consolidated financial statements and the related notes (the “Financial Statements”) have been prepared in conformity with the U.S. Securities and Exchange Commission (the “SEC”) requirements for quarterly reports on Form 10-Q, and consequently exclude certain disclosures normally included in audited consolidated financial statements prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”).These Financial Statements include the accounts of the Company and its consolidated subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The Financial Statements should be read in conjunction with the audited consolidated financial statements and the notes contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021, as well as the financial statements of Sky for the year ended December 31, 2021 file by the Company on its Current Reports on Form 8-K/A on March 28, 2022, which includes additional disclosures and a summary of the Company's significant accounting policies. In the Company’s opinion, these Financial Statements include all adjustments, consisting of normal recurring items, considered necessary by management to fairly state the Company’s results of operation, financial position, and cash flows. Certain prior year amounts have been reclassified to conform to the current year’s presentation. Except for per share data, all dollar amounts are in thousands unless otherwise noted.

Notwithstanding the legal form of the Yellowstone Transaction pursuant to the terms therein, the Yellowstone Transaction was accounted for as a reverse recapitalization in accordance with GAAP (the “Reverse Recapitalization”). Under this method of accounting, Yellowstone was treated as the acquired company for financial reporting purposes, and Sky was treated as the accounting acquirer. In accordance with this accounting method, the Yellowstone Transaction was treated as the equivalent of Sky issuing stock for the net assets of Yellowstone, accompanied by a recapitalization.

Sky was deemed the accounting acquirer for purposes of the Yellowstone Transaction based on an evaluation of the following facts and circumstances:

• The LLC Interests, through their ownership of the Class B Common Stock, hold a majority voting interest in the Company;

• The LLC Interests have the ability to nominate and elect the majority of the Company’s Board of Directors;

• Sky’s senior management team comprises the senior management of the Company; and

• Sky’s assets were larger in relative size compared to Yellowstone’s assets prior to the Yellowstone Transaction.

Thus, the financial statements included in this quarterly report for the three and six months ended June 30, 2022 reflect (i) the historical operating results of Sky prior to the Yellowstone Transaction; (ii) the combined results of Sky and SHG from the date of the Yellowstone Transaction; and (iii) the net assets of SH (formerly Yellowstone) were stated at historical cost, with no goodwill or other intangible assets recorded.

Use of Estimates

The preparation of consolidated financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Such estimates include assumptions used within impairment analyses, estimated useful lives of depreciable assets and amortizable costs, estimates of inputs utilized in determining incentive compensation expense and financial instruments such as warrants, and estimates and assumptions related to right-of-use assets and operating lease liabilities. Actual results could differ materially from those estimates.

Risks and Uncertainties

The Company’s operations have been limited to-date. For most of its history, the Company was engaged in securing access to land through ground leases, and developing and constructing aviation hangars. The major risks faced by the Company is its future ability to obtain additional tenants for the facilities that it constructs, and to contract with such tenants for rental income in an amount that is sufficient to meet the Company’s financial obligations, including increasing construction costs due to inflation.

In March 2020, the World Health Organization declared coronavirus 2019 (“COVID-19”) a global pandemic. The outbreak of COVID-19 caused severe disruptions in the global economy and has adversely impacted businesses and financial markets. During 2020, the Company experienced delays in construction due to COVID-19 mandates such as physical distancing, supply chain issues, and subcontractor availability. In 2020, there was a significant slowdown in the aviation sector in general due to decreased travel which has since eased, particularly in private aviation. During 2021 and 2022 to-date, vaccinations for COVID-19 have become widely distributed among the general population which has resulted in loosened restrictions previously mandated. However, the potential emergence of vaccine-resistant variants of COVID-19 could result in restrictions being mandated again or affect the timing of loosened restrictions. The Company’s management is not able, at this time, to determine what, if any, the ultimate impact COVID-19 will have on its future financial condition, results of operations and cash flows.

As contemplated by the Equity Purchase Agreement, on the Closing Date, the following occurred:

• Yellowstone changed its name to Sky Harbour Group Corporation.

• All outstanding shares of stock held by BOC Yellowstone LLC (the “Sponsor”) were converted into shares of Class A Common Stock, $0.0001 par value (“Class A Common Stock”) of the Company.

• Sky restructured its capitalization and issued to the Company 14,937,581 Sky Common Units, which was equal to the number of outstanding shares of Class A Common Stock immediately after giving effect to the Equity Purchase Agreement. The number of outstanding shares after the Equity Purchase Agreement reflected the redemption of Class A Common Stock (by former holders of the special purpose acquisition company shares that elected to redeem such shares) and the Class A Common Stock issued as a result of the BOC PIPE investment (the “BOC PIPE”), the reclassification of the existing Sky Common Units (other than the Sky Incentive Units, as defined in Note 11), existing Sky Series A preferred units (the “Series A Preferred Units”) and Series B preferred units (the “Series B Preferred Units”) into Sky Common Units.

• Certain adjustments were affected to the number of Sky Incentive Units to reflect the new capital structure.

• SHG was appointed as the managing member of Sky under the Third Amended and Restated Operating Agreement (the “A&R Operating Agreement”).

• The Sky Common Units issued to the Sponsor in respect of Sky’s Series B Preferred Units were converted into 5,500,000 shares of Class A Common Stock of the Company.

• The LLC Interests received one share of Class B Common Stock for each Sky Common Unit that they held, and as consideration for the issuance of 14,937,581 Sky Common Units by Sky to the Company, Yellowstone contributed to Sky the net amount held in the Yellowstone trust account after deducting the amount required to fund the redemption of the Class A Common Stock held by eligible stockholders who properly elected to have their shares redeemed as of the Closing Date and the amount of various transaction costs.

• The Yellowstone Warrants that were issued and outstanding immediately prior to the Closing Date became SHG Warrants.

The following table reconciles the elements of the Yellowstone Transaction to the consolidated statements of changes in equity for the six months ended June 30, 2022:

Transaction costs and advisory fees of approximately $12.7 million includes $14.7 million of total transaction costs incurred at or around closing of the Yellowstone Transaction, $0.6 million of transaction costs paid prior to December 31, 2021, less $2.6 million of costs for insurance that was recorded within prepaid expenses and other assets on the Closing Date.

The following table reconciles the number of shares of SHG Common Stock immediately following the consummation of the Yellowstone Transaction:

Tax Receivable Agreement

On the Closing Date, in connection with the completion of the Yellowstone Transaction and as contemplated by the Equity Purchase Agreement, the Company, Sky, the LLC Interests, and the TRA Holder Representative, entered into a tax receivable agreement (the “Tax Receivable Agreement”). Pursuant to the Tax Receivable Agreement, the Company will generally be required to pay the LLC Interests 85% of the amount of savings, if any, in U.S. federal, state, local, and foreign taxes that are based on, or measured with respect to, net income or profits, and any interest related thereto that the Company realizes, or is deemed to realize, as a result of certain tax attributes, including:

• existing tax basis in certain assets of Sky and certain of its direct or indirect subsidiaries, including assets that will eventually be subject to depreciation or amortization, once placed in service, attributable to Sky Common Units acquired by the Company from a TRA Holder, as determined at the time of the relevant acquisition;

• tax basis adjustments resulting from taxable exchanges of Sky Common Units (including any such adjustments resulting from certain payments made by the Company under the Tax Receivable Agreement) acquired by the Company from a TRA Holder pursuant to the terms of the A&R Operating Agreement; and

• tax deductions in respect of portions of certain payments made under the Tax Receivable Agreement (each of the foregoing, collectively, the “Tax Attributes”).

As of June 30, 2022, no transactions occurred that would result in a cash tax savings benefit that would trigger the recording of a liability based on the terms in the Tax Receivable Agreement.

The Company’s portfolio as of June 30, 2022 includes the following development projects:

Constructed assets, net, and cost of construction, consists of the following:

Depreciation expense for the three months ended June 30, 2022 and 2021 totaled $139 and $133, respectively. Depreciation expense for the six months ended June 30, 2022 and 2021 totaled $274 and $269, respectively.

Long-lived assets, net, consists of the following:

Depreciation expense for the six months ended June 30, 2022 and 2021 totaled $25 and $14, respectively. Depreciation expense for the three months ended June 30, 2022 and 2021 totaled $15 and $8, respectively.

During the three months ended June 30, 2022, the Company evaluated the development progress related to its smart hangar app. This evaluation included the decision to abandon previous software development efforts and the transition of development efforts to a new third-party development company. In connection with this evaluation, the Company determined that previously capitalized software costs associated with the abandoned development were not recoverable and recognized an impairment loss of $248 during the three and six months ended June 30, 2022.

Prepaid expenses and other assets

In July 2022, the Company entered into a vendor agreement to acquire construction materials related to the Company's development projects (the “Vendor Agreement”). In connection with the Vendor Agreement, the Company entered into a revolving line of credit loan and security agreement (the "Vendor Loan Agreement"), whereby the Company agreed to provide up to $2.5 million of availability under a revolving credit line to fund the working capital requirements of the vendor, of which $1.5 million was loaned to the vendor in July 2022. The Vendor Loan Agreement matures in July 2029 and initially bears interest at a rate of 5% per annum for the first year, and increases by 1% per annum each year on the anniversary date of the Vendor Loan Agreement until its maturity.

Accounts payable, accrued expenses and other liabilities

Accounts payable, accrued expenses and other liabilities, consists of the following:

The following table summarizes non-cash activities associated with the Company’s operating leases:

The following table summarizes interest paid:

The following table provides a reconciliation of cash and restricted cash reported within the consolidated balance sheets to the total shown within the consolidated statements of cash flows:

Lessee

All of the Company’s leases are classified as operating leases under ASC Topic 842. Management has determined that it is reasonably certain that the Company will exercise its options to renew the leases, and therefore the renewal options are included in the lease term and the resulting ROU asset and operating lease liability balances. As the Company’s lease agreements do not provide a readily determinable implicit rate, nor is the rate available to the Company from its lessors, the Company uses its incremental borrowing rate to determine the present value of the lease payments.

The Company’s lease population does not include any residual value guarantees, and therefore none were considered in the calculation of the ROU and operating lease liability balances. The Company has operating leases that contain variable payments, most commonly in the form of common area maintenance and operating expense charges, which are based on actual costs incurred. These variable payments were excluded from the calculation of the ROU asset and operating lease liability balances since they are not fixed or in-substance fixed payments. These variable payments were not material in amount for both of the three and six month periods ended June 30, 2022 and 2021. Some of the leases contain covenants that require the Company to construct the hangar facilities on the leased grounds within a certain period and spend a set minimum dollar amount. For one of the leases, the shortfall (if any) must be paid to the lessor. See Note 15.

The Company’s ground leases have terms ranging between 27 to 75 years, including options for the Company to extend the terms. These leases expire between 2049 and 2097, which include all lease extension options available to the Company. Certain of the Company's ground leases contain options to lease additional parcels of land at the Company's option within a specified period of time.

The Company’s ground lease at OPF was entered into in May 2019 through its wholly owned subsidiary, Sky Harbour Opa Locka Airport LLC (“SHOLA”), with AA Acquisitions LLC (“AA”). AA is the master ground lessee of Miami Dade County (“MDC”), the ultimate landowner. On April 29, 2022, the Company, through a wholly-owned subsidiary outside the Obligated Group (as defined in Note 8), purchased AA’s underlying interest in the ground lease for approximately $8.5 million and now leases the OPF property directly from MDC (the “OPF Lease Transaction”). The OPF Lease Transaction also required the Company to pay approximately $1.0 million in assignment fees to MDC, which, along with the $8.5 million purchase price, were recognized as initial direct costs and presented as a component of right-of-use assets. Following the OPF Lease Transaction, SHOLA continues to be obligated under the existing sublease but to an affiliate within the Company. The OPF Lease Transaction extends the term of the lease at OPF for the Company to approximately 57 years. The Company has accounted for the OPF Lease Transaction as a lease modification requiring remeasurement and remeasured the right-of-use asset and operating lease liability utilizing the Company’s incremental borrowing rate as of the date of remeasurement. As a result of the remeasurement, non-cash subtractions to the right-of-use asset and operating lease liability of $12,289 were recorded during the six months ended June 30, 2022.

On January 1, 2021, the Company commenced an operating lease for a ground lease located at APA (“APA Lease”), with an initial lease term of 41 years (or up to 76 years including extension options). The APA Lease contains an option to lease an additional parcel of land (Phase II) that must be exercised, at the Company’s option, within three-years of the lease’s commencement date.

On May 4, 2021, the Company commenced an operating lease for a ground lease located at DVT (“DVT Lease”), with a lease term of 40 years. The DVT Lease contains an option to lease an additional parcel of land (Phase II) that must be exercised, at the Company’s option, within four-years of the lease’s commencement date.

On June 28, 2022, the Company commenced an operating lease for a ground lease located at ADS (“ADS Lease”). The ADS Lease term is 40 years from the completion of construction with no additional extension options, which is the maximum allowable term permitted by the Town of Addison.

In addition to the Company’s ground leases, the company has operating leases for office space and a ground support vehicle.

Supplemental consolidated cash flow information related to the Company’s leases was as follows: 

Supplemental consolidated balance sheet information related to the Company’s leases was as follows: 

The Company’s future minimum lease payments required under leases as of June 30, 2022 were as follows: 

Lessor

The Company leases the hangar facilities that it constructs to third-party tenants. These leases have been classified as operating leases. The Company does not have any leases classified as sales-type or direct financing leases. Lease agreements with tenants are either on a month-to-month basis or have a defined term with an option to extend the term. The defined term leases vary in length from one to five years with options to renew for additional term(s) given to the lessee. One of the agreements contains an option by either party to terminate with appropriate notice, as defined. There are no options given to the lessee to purchase the underlying assets. The Company determines whether a contract contains a lease at the inception of the contract. The Company expects to continue to derive benefit from the underlying assets after the end of the lease term through further leasing arrangements. The underlying assets are the leasehold interest that the Company has in connection with its ground leases. There are no residual value guarantees. The Company mitigates risk related to the residual value of the assets by negotiating with current tenants and attempting to secure future tenants through letters of intent prior to the current lease term’s termination and/or the substantial completion of the promised hangar facilities that are presently under construction.

The leases may contain variable fees, most commonly in the form of tenant reimbursements, which are recoveries of the common area maintenance and operating expenses of the property and are recognized as income in the same period as the expenses are incurred. The leases did not have any initial direct costs. The leases do not contain any restrictions or covenants to incur additional financial obligations by the lessee.

Tenant leases to which the Company is the lessor require the following non-cancelable future minimum lease payments from tenants as of June 30, 2022:

Bonds payable

On May 20, 2021, Sky formed a new wholly-owned subsidiary, Sky Harbour Capital LLC, as a parent corporation to its wholly-owned subsidiaries that operate each of the aircraft hangar development sites under its ground leases. Sky Harbour Capital LLC and these subsidiaries form an Obligated Group (the “Obligated Group” or the “Borrowers”) under a series of bonds that were issued in September 2021 with a principal amount of $166.3 million (the “Series 2021 Bonds”). The members of the Obligated Group are jointly and severally liable under the Series 2021 Bonds. SHG and its other subsidiaries are not members of the Obligated Group and have no obligation to repay the bonds.

The Series 2021 Bonds are payable pursuant to a loan agreement dated September 1, 2021 between the Public Finance Authority (of Wisconsin) and the Borrowers. The payments by the Borrowers under the loan agreement are secured by a Senior Master Indenture Promissory Note, Series 2021-1 issued by the Obligated Group under an indenture (the “Master Indenture”). The obligations of the Borrowers are collateralized by certain leasehold and subleasehold deeds of trust or mortgages on the Borrowers’ interests in the development sites and facilities being constructed at each airport where the Borrowers hold ground leases. In addition, the Borrowers have assigned, pledged and granted a first priority security interest in all funds held under the Master Indenture and all right, title and interest in the gross revenues of the Borrowers. Furthermore, Sky, Sky Harbour Holdings LLC and Sky Harbour Capital LLC have each pledged as collateral its respective ownership interest in any of the Borrowers.

The bond trustee established various restricted bank accounts which were initially funded with the bond proceeds and cash on hand. The bond trustee will continue to control the Borrowers’ cash receipts and disbursements under a Trust Agreement. Such restricted funds are available to fund the construction expenditures of the two phases of OPF, BNA, DVT, and APA, and SGR Phase II, and, with certain approvals and supplemental reports, up to $50 million at other airport sites, in addition to certain operating expenses such as ground lease expense. These accounts also include funds to pay debt service through the end of construction at each site and various reserve funds such as a ramp-up reserve, debt service reserve, and a maintenance reserve fund. Such trust bank accounts total approximately $175.5 million, of which $37.5 million and $138.0 million and are included in Restricted cash and Restricted investments, respectively, on the consolidated balance sheet as of June 30, 2022.

The Borrowers have agreed to use all commercially reasonable efforts to jointly maintain a Debt Service Coverage Ratio (as defined in the agreement) of 1.25 for each applicable test period; provided, however, that the failure to maintain this ratio will not be considered an event of default so long as the Obligated Group takes all commercially reasonable action for correcting such deficiency. The measurement of the Debt Service Coverage Ratio will commence with the period ending December 31, 2024. If the Debt Service Coverage Ratio as of the end of any fiscal quarter is less than 1.0, the parent companies of the Borrowers will make contributions to the borrowers or otherwise cause the Debt Service Coverage Ratio to be at least 1.0 within 10 business days of the test date. If the Debt Service Coverage Ratio as of the end of any fiscal quarter is less than 1.25, Sky Harbour Capital LLC must deliver to the trustees, within 120 days, an independent consultant’s report and a specific plan designed to achieve a Debt Service Coverage Ratio of 1.25 in the following fiscal year.

The Series 2021 Bonds have principal amounts, interest rates, and maturity dates as follow: $21.1 million bearing interest at 4.00%, due July 1, 2036; $30.4 million bearing interest at 4.00%, due July 1, 2041; and $114.8 million bearing interest at 4.25%, due July 1, 2054. The Series 2021 Bond that has a maturity date of July 1, 2036 was issued at a premium, and the Company received bond proceeds that were $0.2 million above its face value. The bond premium is being amortized as a reduction of interest expense over the life of the bond. Interest is payable on each January 1 and July 1, commencing January 1, 2022. Principal repayments due under the Series 2021 Bonds are paid annually, commencing July 1, 2032.

The bonds maturing on July 1, 2036 are subject to optional early redemption, at the option of Sky Harbour Capital LLC, on or after July 1, 2028, in whole or in part, at a redemption price equal to the principal amount plus interest accrued to the redemption date. The bonds maturing on July 1, 2041 and July 1, 2054 are subject to optional early redemption, at the option of Sky Harbour Capital LLC, on or after July 1, 2031, in whole or in part, at a redemption price equal to the principal amount plus interest accrued to the redemption date. An extraordinary optional redemption is permitted in the event of damage or destruction of any of the underlying assets.

The Series 2021 Bonds are mandatorily redeemable upon the occurrence of certain events. Upon the sale of an asset by any Borrower, the applicable portion of the Series 2021 Bonds is subject to special mandatory redemption at prices specified in the agreement. Upon the occurrence of a determination of taxability in which the interest income of any of the bonds does not qualify as being excludable from the gross income of the holder (with limited exclusions), the Series 2021 Bonds are subject to mandatory redemption within 60 days, at a redemption price equal to the principal amount plus accrued interest. Upon the termination of any ground lease of a Borrower, and unless certain other certifications can be made, the Series 2021 Bonds are subject to redemption in an amount and at a redemption price as specified in the agreement. In lieu of redemption, the Bonds may be purchased by any of the Borrowers or by any party designated by Sky Harbour Capital LLC.

The following table summarizes the Company’s Bonds payable as of June 30, 2022 and December 31, 2021:

In connection with the issuance of the Bonds Payable, the Company recognized debt issuance costs totaling $6 million which are being amortized into interest using the effective interest method over the life of the bonds. Interest that is incurred at the stated interest rate of the bonds, as well as the amortization of bond premium and amortization of debt issuance costs are capitalized and added to the cost of construction on the consolidated balance sheet. See Interest, below.

Loans payable

In connection with two of its development projects, Sky had two secured construction loans that were outstanding during the three and six months ended June 30, 2021, and through the loans’ respective payoff dates of August 11, 2021 and September 3, 2021.

Sky closed on a construction loan on August 28, 2019 for up to $16.7 million for the development of the SGR project (the “SGR Loan”). The loan bore interest at LIBOR (subject to a minimum of 2.2%) plus 6%, plus pay-in-kind (“PIK”) interest of 2% which was added to the principal amount. The SGR Loan was repaid on September 3, 2021, including all accrued and PIK interest.

On January 23, 2020, Sky closed on a construction loan for up to $46.0 million for the development of the OPF project (the “OPF Loan”). The loan bore interest at LIBOR (subject to a minimum of 1.669%) plus 6%, plus PIK interest of 2% which was added to the principal amount.  An amendment to the loan on March 12, 2021 increased the interest rate to LIBOR (subject to a minimum of 1.669%) plus 8%, plus PIK interest of 2% that was added to the principal amount. The OPF Loan was repaid on August 11, 2021, including all accrued and PIK interest.

As part of Yellowstone’s initial public offering, Yellowstone issued to third-party investors 6,799,439 warrants which entitled the holder to purchase one share of Class A Common Stock at an exercise price of $11.50 per share (the “Public Warrants”). In addition, 7,719,779 private placement warrants were sold to the Sponsor (the “Private Placement Warrants”, and together with the Public Warrants, the “Warrants”). Each Private Warrant allows the Sponsor to purchase one share of Class A Common Stock at an exercise price of $11.50 per share. Following the Yellowstone Transaction, the Warrants remain outstanding under the same terms and conditions to purchase shares of the Company’s Class A Common Stock. As of June 30, 2022, 6,799,439 and 7,719,779 Public and Private Warrants remain outstanding, respectively.

The terms of the Private Warrants are identical to those of the Public Warrants, except for that so long as the Private Warrants are held by the Sponsor or its permitted transferees, they may be exercised on a cashless basis. The Warrants contain an exercise price of $11.50 per share and expire on January 25, 2027. The Company determined the fair value of its Public Warrants based on the publicly listed trading price as of the valuation date. Accordingly, the Public Warrants are classified as Level 1 financial instruments. As the terms of the Private Warrants are identical to those of the Public Warrants, the Company determined the fair value of its Private Warrants based on the publicly listed trading price of the Public Warrants as of the valuation date and have classified the Private Warrants as Level 2 financial instruments.

The closing price of the Public Warrants was $0.45 and $0.55 per warrant on June 30, 2022 and the Closing Date, respectively. The aggregate fair value of the Warrants was approximately $6.5 million and $8.0 million as of June 30, 2022 and the Closing Date, respectively. The Company recorded an unrealized gain of approximately $15.4 million during the three months ended June 30, 2022. During the six months ended June 30, 2022, the Company recorded an unrealized gain of approximately $1.5 million, reflecting the change in fair value of the Warrants from the Closing Date through June 30, 2022.

Prior to the Yellowstone Transaction

Sky and its members initially entered into a Limited Liability Company Agreement on February 12, 2018. This LLC agreement was subsequently amended and restated on March 12, 2021 (the “A&R Operating Agreement”), which was again amended and restated on September 14, 2021 (the “Second A&R Operating Agreement”). On January 25, 2022, in connection with the Yellowstone Transaction, Sky, its members, and SHG entered into the A&R Operating Agreement.

On March 12, 2021, there was a change in the ownership of Sky such that the former majority member no longer held an interest in Sky pursuant to a redemption agreement (the “Redemption Agreement”), and additional members invested in Sky pursuant to a unit purchase agreement (the “Unit Purchase Agreement”). Pursuant to the Unit Purchase Agreement, Sky’s former minority member (the “Founder”) received founder units of Sky (the “Founder Units”) and the new investors purchased a total of $31.3 million in Series A Preferred Units of Sky. Pursuant to a convertible note and exchange agreement dated March 12, 2021 (the “Convertible Note and Exchange Agreement”), a portion of the proceeds from the issuance of the Series A Preferred Units were used to fully satisfy outstanding note payable between Sky and a related party as described in Note 14.

On August 1, 2021, Sky entered into the Equity Purchase Agreement with Yellowstone. In conjunction with the Equity Purchase Agreement, Boston Omaha Corporation agreed to invest $55.0 million of equity in the form of Redeemable Series B Preferred Units through its affiliate BOC YAC Funding LLC (“BOC YAC”). On September 14, 2021 Sky issued 8,049 Series B Preferred Units to BOC YAC in exchange for the $55.0 million. The Series B Preferred Units contained redemption rights for both Sky and for the holders of the Series B Preferred Units under certain circumstances. Because the Series B Preferred Units were redeemable in cash, they were classified as Temporary Equity, between the Liabilities and Equity sections of the consolidated balance sheet as of December 31, 2021. They were carried at their net issuance price and not reflected at redemption value in the consolidated balance sheet because no Series B Preferred Units were redeemed between December 31, 2021 and January 25, 2022, the date such Units were automatically converted to the Company’s Class A Common Stock equal to the original $55.0 million investment at the conversion price of $10 per share.

Restricted Stock Units (“RSUs”)

In May 2022, the Company granted time-based RSUs to certain employees under the Company’s 2022 Incentive Award Plan. A total of 721,000 of time-based awards were granted, which will vest ratably over a four-year period beginning on the first anniversary of the grant date and ending on May 16, 2026. During the three and six months ended June 30, 2022, the Company recognized stock compensation expense of $160. As of June 30, 2022, there are approximately 661,000 non-vested RSUs outstanding with a weighted average grant date fair value of $7.74. The unrecognized compensation costs associated with all unvested RSUs at June 30, 2022 was $4,956.

Sky Incentive Units

In May 2021, Sky granted 3,951 Sky Incentive Units to certain employees. In connection with the Yellowstone Transaction and the execution of the Third A&R Operating Agreement, the number of existing Sky Incentive Units outstanding was adjusted based on a defined unit conversion ratio to reflect the new capital structure (see Note 10) and remain Sky Incentive Units, resulting in 2,807,750 outstanding Sky Incentive Units. These Incentive Units may be exchanged for Sky Common Units at the holder’s discretion upon vesting. There were no changes to the terms or conditions of the Sky Incentive Units effected by the Yellowstone Transaction. The Sky Incentive Units are classified as equity instruments.

The Sky Incentive Units were valued as of the date of grant using the Option-Pricing Method described in the AICPA Accounting and Valuation Guide entitled Valuation of Privately Held Company Equity Securities Issued as Compensation. The Option-Pricing Method treated profit units (such as Sky Incentive Units) and the capital units outstanding at the time of the valuation (Sky’s Series A Preferred Units, Series B Preferred Units, and the Founder Units) as call options on the total equity value of Sky, with exercise (or strike) prices based on the incremental equity required to repay liquidation preferences for the various holders of Sky interests. The values of the options associated with each strike price were calculated using the Black-Scholes option pricing model based on the grant date. The Sky Incentive Units were classified as Level 3 in the fair value hierarchy. The key inputs and assumptions used in the valuation of the Sky’s Incentive Units were:

Below is a summary of activity related to the Sky Incentive Units for the six months ended June 30, 2022:

The Company recognizes equity-based compensation expense on a straight-line basis over the requisite service period and has elected to account for forfeitures of Sky Incentive Units if and when they occur. The Company recorded equity-based compensation expense relating to Sky Incentive Units of $85 and $171 for the three and six months ended June 30, 2022, respectively, which is recorded within General and Administrative Expenses within the statement of operations, and as a component of the non-controlling interest in the consolidated statement of changes in stockholders’ equity. The Company recorded equity-based compensation expense relating to Sky Incentive Units of $46 for the three and six months ended June 30, 2021. As of June 30, 2022, there was $871 of total unrecognized compensation expense that is expected to be recognized over a weighted-average future period of 2.7 years.

Basic earnings (loss) per share of Class A Common Stock is computed by dividing net income (loss) attributable to SHG by the weighted-average number of shares of Class A Common Stock outstanding during the period. Diluted net income (loss) per share of Class A Common Stock is computed by dividing net income (loss) attributable to SHG, adjusted for the assumed exchange of all potentially dilutive securities, by the weighted-average number of shares of Class A Common Stock outstanding adjusted to give effect to potentially dilutive shares using the treasury stock method.

Shares of the Company’s Class B Common Stock do not participate in the earnings or losses of the Company and are therefore not participating securities. As such, separate presentation of basic and diluted earnings per share of Class B Common Stock under the two-class method has not been presented. For the three and six months ended June 30, 2021, the membership structure of Sky solely included holders of Sky Common Units that received an equivalent number of Class B Common Stock following the Yellowstone Transaction, and there were no holders that received Class A Common Stock. As the shares of Class B Common Stock are not participating securities, presentation of net loss per share for the three and six month periods ended June 30, 2021 would not be meaningful to the users of these condensed consolidated financial statements, and such information has not been presented.

Potentially dilutive shares associated with the outstanding Warrants were antidilutive for the six months ended June 30, 2022 due to the Company’s net loss position. Thus, 14,519,218 shares issuable upon the exercise of the Warrants were excluded from the calculation of diluted weighted average shares outstanding and diluted loss per share for the six months ended June 30, 2022.  651,514 and 661,000 antidilutive shares associated with the Company's restricted stock units were excluded from the calculation for the three and six months ended June 30, 2022, respectively.

The following table summarizes the carrying value, estimated fair value and classification of our financial instruments as of:

The fair value of the Company’s investments and restricted investments is estimated utilizing Level 1 inputs including prices for U.S. Treasury securities with comparable maturities on active markets. The fair value of the Company’s bonds is estimated utilizing Level 2 inputs including prices for the bonds on inactive markets. See Note 9 for discussion regarding the estimation of the fair value of the warrants. The carrying values of all other financial instruments on the consolidated balance sheets, approximate their fair values due to the short-term nature of these instruments.

Loans payable to Related parties

Sky previously was party to a loan from a company owned by its former majority member. The loan payable bore interest at an annual rate of 5.50% and all interest was PIK interest. On March 12, 2021, pursuant to a Redemption Agreement between Sky and the former majority member, the loan was cancelled and all of the membership interests held by the former majority member were redeemed in exchange for a sum of $5.1 million, plus a Reimbursement and Indemnity Agreement from Sky and the Founder and CEO. Sky recorded a gain on extinguishment of this related party loan payable of $5.6 million, net of related expenses of $0.15 million and net of redemption of membership interests. The gain was recognized as a deemed contribution to stockholders’ equity on the consolidated balance sheet. Interest incurred on the loan payable to for the three and six months ended June 30, 2021 totaled $0 and $120, respectively.

Beginning in November 2020, Sky entered into a note payable with a related party, SH Investment Fund I LLC, a company controlled by the Founder and CEO. The note payable bore interest at 8% per annum and had a maturity date of November 24, 2021. Amounts payable under the note were drawn by requesting “advances” from the lender, up to $1,000,000, and could be used by Sky only for certain types of expenditures that were approved in advance by the lender. On March 12, 2021, Sky issued 1,250 Series A Preferred Units in full satisfaction of the note payable by the Sky to SH Investment Fund I LLC. The fair value of the 1,250 units was $1.25 million and exceeded the carrying value of the $1.0 million note payable at the time of extinguishment; thereby resulting in a loss on extinguishment of related party debt of $0.25 million which was recorded as a charge in the consolidated statement of operations.

Services

For the three and six months ended June 30, 2022, the Company paid $25 and $45 respectively, for consulting services, to a company that employed the chief financial officer until prior to July 1, 2021. The Company paid $32 and $62 during the three and six months ended June 30, 2021 to the same company.

On September 20, 2021, the Company entered into a non-exclusive agreement with Echo Echo, LLC, a related party to the Founder and CEO, for the use of a Beechcraft Baron G58 aircraft. The effective date of the agreement was September 8, 2021 and the agreement automatically renews annually. The agreement can be terminated without penalty if either party provides 35 days written notice, or if the aircraft is sold or otherwise disposed of. The Company is charged per flight hour of use along with all direct operating costs. Additionally, the Company will also incur the pro rata share of maintenance, overhead and insurance costs of the aircraft. For the three and six months ended June 30, 2022, the Company recognized $53 and $84 of expense, respectively, within General and administrative expense under the terms of this agreement, and the related liability is included in Accounts payable, accrued expenses and other liabilities on the consolidated balance sheet as of June 30, 2022.

In addition to the lease payment commitments discussed in Note 7, the ground leases to which the Company is a party contain covenants that require the Company to conduct construction of hangar facilities on the leased grounds within a certain period and in some cases, to spend a minimum dollar amount.

With respect to the Company’s SGR Phase II project, the Company is subject to requirements that define (i) a minimum improvement amount of $2.0 million and (ii) that related construction commence by October 2022 and be completed by October 2023. If these conditions are not met or otherwise waived or amended, the ground lease for the parcels designated for the SGR Phase II project will automatically terminate.

The Company has committed to spend $17.0 million in capital improvements on the BNA construction project by July 2, 2023. If this amount is not expended, the shortfall would become due and payable within 60 days as additional rent under the lease agreement.

The APA Lease requires the Company to improve the property in accordance with a development plan included in the lease and to complete such improvements within 24-months of the issuance of permitting documents. The APA Phase I project is still in the permitting phase.

The DVT Lease requires improvements to be made for Phase I (estimated cost of improvements of $15.3 million) and for Phase II, if such option is exercised (estimated cost of improvements of $14.6 million), within 12-months after receiving permitting documents for each Phase, but in no event later than May 2026. The Company is still in the permitting phase of its DVT Phase I project.

The Company has committed to spend $10.0 million in capital improvements on the ADS construction project. If this amount is not expended, the Company is subject to a reduction of the term of the lease.

The Company has contracts for construction of the OPF Phase I project and the BNA project. The Company may terminate either of the contracts or suspend construction without cause; however, the Company would be subject to paying a penalty under the OPF construction contract of 50% of the unrealized fee which remains to be earned as of the termination date. There is no termination penalty under the BNA construction contract.

The following table summarizes the components of Accumulated other comprehensive income (loss):