Federal officials blame disruptions on understaffing at airlines - who counter by noting staff problems at the FAA, which employs air traffic controllers.
A House bill that would put the aviation industry in charge of air traffic control has repeatedly stalled and prospects appear even worse in the Senate, where there has been no effort to take up the issue.
Alaska Airlines says it is taking precautions including requiring employees to change their passwords after Virgin America’s computer systems were hacked.
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