The Mercury NewsAirlines make it harder to earn free flights for loyaltyThe Mercury NewsIn this Tuesday, March 24, 2015, file photo, a traveler walks past a sign advertising a Delta Air Lines credit card at Seattle-Tacoma International Airport in SeaTac, Wash. Airline loyalty programs are losing much of their allure even for frequent ...Delta plane collides with American plane, causing damage and lengthy delayFox NewsWingtip of Delta Air Lines plane clips another planeWRAL.comIs Delta 'The Best Positioned' Airline?TheStreet.comStocks Gallery -Barron's -Sports Perspectives -Rincon Hill Newsall 90 news articles »