File photo - A Frontier... Pictures

File photo - A Frontier Airlines Airbus 319 heads down the tarmac at Denver International Airport to a nearby runway for takeoff in Denver. (AP Photo/David Zalubowski, FILE)
File photo - A Frontier Airlines Airbus 319 heads down the tarmac at Denver International Airport to a nearby runway for takeoff in Denver. (AP Photo/David Zalubowski, FILE)

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