International Consolidated Airlines Group SA (IAG.LN) said Thursday that the joint business its subsidiaries British Airways and Iberia have with American Airlines Group Inc. (AAL) has been extended to include American's merger partner, US Airways, in a deal that would boost the group's trans-Atlantic routes, revenue and traffic.

IAG's Atlantic joint business is a revenue-sharing agreement under which member airlines have permission to coordinate schedules and pricing on North Atlantic routes. The arrangement now includes all scheduled flights between North America and Europe operated by Oneworld Alliance members American and US Airways, which merged Dec. 9, along with British Airways, Iberia and Finnair.

US Airways brings 28 trans-Atlantic routes to the table, 27 of which are new to the alliance. IAG said that customers of British Airways and Iberia now will have access to more than 50 additional new destinations in North America. These include direct flights from London and Manchester, England, to Charlotte, N.C.; Manchester, Glasgow and Edinburgh to Philadelphia; and Madrid and Barcelona to Philadelphia and Charlotte.

IAG said the extended business would enable feeder traffic from more than 240 destinations in North America to connect through American and US Airways' nine hubs for trans-Atlantic flights.

Separately Thursday, IAG said that group premium traffic, from its long-haul operations, increased by 8.6% in March compared with the same period last year. Overall traffic, measured in revenue passenger kilometers, increased by 10.2% year-over-year.

Write to Marietta Cauchi at marietta.cauchi@wsj.com

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