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This story was updated at 1:58 p.m.
BOSTON (WBZ NewsRadio) — The Federal Aviation Administration says flights are back in the air nationwide after a major computer outage on Wednesday morning. All departures were grounded until about 9 a.m.
The aftershock of the grounding caused a cascade of delays nationwide. More than 300 flights were delayed at Logan and about 40 were cancelled as of mid-afternoon on Wednesday, according to Flight Aware.
The FAA said its Notice to Air Missions System (NOTAM) was experiencing an outage and that "operations across the National Airspace System" were affected. NOTAM is the system that alerts pilots nationwide to immediate hazards and threats.
Before the halt, United Airlines said it had temporarily delayed all of its domestic flights on Wednesday morning.
The White House said President Biden was aware of the outages and that there was "no evidence of a cyberattack at this point," according to White House Press Secretary Karine Jean-Pierre.