Travelers wait in the Delta Air Lines Inc. Sky Priority baggage check-in line of Terminal 5 at Los Angeles International Airport (LAX) in Los Angeles, California, U.S., on Monday, Aug. 17, 2015. LAX is one of a handful of major U.S. airports where no one carrier dominates -- each of the four biggest airlines now holds market share between 14 percent and 18 percent. Photographer: Patrick T. Fallon/Bloomberg via Getty Images
