Delta and American’s Earnings Raise Big Questions About Summer Travel


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Delta Air Lines said advance bookings for the summer are at record levels.

Photograph by Jamie Squire/Getty Images

It has been a turbulent few days for U.S. airline stocks, despite a healthy dose of seemingly good news from both Delta Air Lines and American Airlines

But investors are nervous about the sector’s prospects heading into the key summer months, and they’re right to be at least a little concerned.