By Saumya Vaishampayan 

U.S. stocks rose on Wednesday, boosted by earnings from Intel Corp. and Delta Air Lines Inc.

The Dow Jones Industrial Average advanced 105 points, or 0.6%, to 18141. The S&P 500 rose 12 points, or 0.6%, to 2108, and the Nasdaq Composite Index added 21 points, or 0.4%, to 4998.

Delta on Wednesday said earnings in its March quarter more than tripled, beating analyst expectations as the company benefited from lower fuel prices. The airline said it would reduce international capacity by 3% as it deals with the strong dollar. Shares rose 3.7%.

Intel led the Dow higher, up 2.6%. The chip maker late Tuesday reported a 3% rise in net income on overall revenue that was flat compared with the year-ago period. Intel said last month that revenue would suffer in the first quarter due to sagging sales of personal computers. A bright spot was the data center group, which posted a 19% jump in revenue.

Rail operator CSX Corp. said late Tuesday earnings rose 11% in its latest quarter, beating expectations. The company also raised its dividend 13% and announced a new $2 billion share repurchase program. Shares rose 1.1%.

Gains in European stocks added to the positive tone, with France's CAC 40 rising 0.8% and Germany's DAX adding 0.5%. The European Central Bank kept rates unchanged, as expected, leaving its main lending rate at a record low.

"Central banks across the board still look like they're going to stay very accommodative and keep interest rates low for a long time, which equity investors like," said Chris Gaffney, president of EverBank World Markets.

U.S. stocks rose Tuesday, with the Dow adding 0.3% to 18036.70. The S&P gained 0.2% to 2095.84. With Tuesday's gains, the Dow is now 1.4% away from its all-time high of 18288.63 and the S&P is 1% below its record of 2117.39.

Many investors say the next catalyst for the stock market will come from first-quarter earnings. Expectations were slashed going into the reporting season as companies contended with the strong dollar and low oil prices in the period.

"The real question is not if the companies are going to meet those expectations, but what the forward guidance is going to be like," said Mr. Gaffney.

In economic news, U.S. industrial output fell in March and posted the first quarterly decline since the recession ended. The Federal Reserve said industrial production fell 0.6% from the prior month. Economists surveyed by The Wall Street Journal had expected a 0.4% decline in industrial production.

In commodity markets, gold futures added 0.1% to $1194.10 an ounce. Crude-oil futures gained 1.5% to $54.11 a barrel.

The yield on the 10-year Treasury note fell to 1.881%, compared with 1.904% on Tuesday. Yields fall as prices rise.

In other corporate news, European Union regulators formally accused Google Inc. of violating antitrust laws. Shares fell 4.3%.

Bank of America Corp. said Wednesday it swung to a first-quarter profit. Still, results missed analyst expectations, pushing shares down 0.3%.

Write to Saumya Vaishampayan at saumya.vaishampayan@wsj.com

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