Complexity Makes Airline Computer Systems Vulnerable

DALLAS—Twice in less than a month, a major airline was paralyzed by a computer outage that prevented passengers from checking in and flights from taking off.

Last month, it took Southwest days to recover from a breakdown it blamed on a faulty router. On Monday, it was Delta’s turn, as a power outage crippled the airline’s information technology systems and forced it to cancel or delay hundreds of flights. Delta employees had to write out boarding passes by hand, and at one airport they...

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