|Southwest Airlines grounded 250 flights.|
Late in the evening of 21 June 2013, a software failure of unreported origin caused a system-wide outage at Southwest Airlines. The outage lasted for three hours, according to news reports
, until 2A Eastern. During this period, 250 flights were grounded. As reported by USA Today
, "the glitch impaired the airline's ability to do such things as conduct check-ins, print boarding passes and monitor the weight of each aircraft." A backup system was deployed, according to this source, around 8 pm Pacific time, but it was running much more slowly.
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