File-This photo taken Jan. 20, 2011, shows a Delta Airlines Boeing 757 taking off in Tampa, Fla. Delta Air Lines is making fundamental changes to its frequent flier program and will reward those who buy its priciest tickets, as opposed to those who fly the most miles. The airline said Wednesday, Feb. 26, 2014, that the 2015 SkyMiles program will better recognize frequent business travelers and leisure customers who buy premium fares. (AP Photo/Chris O'Meara, File)
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