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Summer travel is booming. Airline investors are about to hear what happens next

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Travelers arrive at main concourse of Denver International Airport in Denver, Colorado on Wednesday, July 7, 2021.
Hyoung Chang | Denver Post | Getty Images

Hordes of U.S. vacationers are back, crowding airports, filling up hotels and national parks. Airlines' second-quarter earnings should give some insight into what happens after the summer surge.

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