Behind each of the four big players in the U.S. airline industry - American, United, Delta and Southwest - there is a tangled computer system pieced together after decades of mergers that married mismatched networks.
Just what went wrong with Delta Air Lines' system Monday that caused hundreds of cancellations and delays is still being sorted out. Was it a power outage, as Delta says? Or was it more likely an internal computer glitch, as Georgia Power, the utility at Delta's Atlanta hub, says?
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