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Now Playing: 4-17-13 Marketplace Tech: How One Computer Glitch Can Keep A Whole Airline Grounded

Computer glitches at home can be frustrating, but what about when they keep an entire airline company from taking off? American Airlines had to cancel over 400 flights and deal with massive delays yesterday when employees couldn't access its computerized reservation system Sabre, which is used by multiple airlines, helps with scheduling, booking, printing boarding passes, and tracking checked bags.