The Standard & Poor's 500 index gained seven points, 0.4 per cent, to 2,027 in early trading Tuesday. Delta Air Lines rose the most in the index, 5.2 per cent, after the company's quarterly results beat Wall Street expectations.
The Dow Jones industrial average rose 33 points, or 0.2 per cent, to 17,543.
The price of benchmark U.S. crude oil fell $2.02, or 4 per cent, to $47.11 a barrel.
Major stock markets in Europe headed higher as a survey showed market optimism rose more in Germany than expected and a survey of bank lending showed more demand from companies for loans.