The carrier will report earnings Thursday, providing an update on the health of the travel sector and the U.S. economy.

Delta Air Lines was one of the top-performing stocks in the S&P 500 Thursday after the carrier reported better second-quarter results than analysts had expected and reinstated its full-year outlook.

Delta Air Lines said on Thursday its bookings have stabilized after a sharp pullback in March and April, but are at a lower level than the company's estimates at the start of the year.