Domestic departures gradually resume after FAA restores its safety system

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Air traffic has resumed, but delays are still piling up, after the FAA halted all departures on Wednesday morning. A system for alerting pilots and airports of real-time hazards, called NOTAM (Notice to Air Missions), failed overnight.

Here's what we know:

• As of 12:30 pm ET on Wednesday, more than 7,000 flights within, into or out of the U.S. had been delayed and more than 1,140 others were canceled.
• The White House said there was "no evidence of a cyberattack" as officials called for investigations into the FAA.
• The incident came on the heels of a previous round of flight delays and cancellations, partially caused by Southwest Airlines.