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Thousands of flights are delayed or cancelled after the Federal Aviation Administration ordered a nationwide pause on domestic flight departures on Wednesday.

The FAA's system for alerting pilots and airports of real-time hazards, called NOTAM (Notice to Air Missions), went dark around

following computer outage

As of noon E.T. more than 6,988 flights into, within or out of the country had been delayed, and just over 1,100 have been canceled altogether, according to data from the tracking site FlightAware. While some of the nation's busiest airports like 

 saw a few dozen cancelations each along with 100+ delays, the impact is being felt by travelers at airports across the system including at

A total of 21,464 flights were scheduled to depart U.S. airports on Wednesday with a carrying capacity of nearly 2.9 million passengers, 

, citing data from aviation analytics company Cirium.  

The FAA had opened a hotline to address equipment issues by 5:58 a.m. ET, as some NOTAM functions began to come back on line. By 9 a.m. ET, the system had been fully restored and flights began to resume, and airports are urging travelers to check with their airlines for updates if they have travel plans Wednesday.

The FAA defines a NOTAM as "a notice containing information essential to personnel concerned with flight operations but not known far enough in advance to be publicized by other means." 

Pilots might receive NOTAMs about closed runways, large flocks of birds, a plume of volcanic ash, ice on a runway, or lights on tall buildings and towers.

Officials pledge to investigate the incident 

Speaking to reporters during the flight pause, President Biden said he expected to know more on the cause of the outage in a few hours.

"They don't know what the cause is," Biden said. "I told [Transportation Secretary Pete Buttigieg] to report directly to me when they find out."

White House press secretary Karine Jean-Pierre tweeted there was "no evidence" of a cyber attack. 

Sen. Ted Cruz, R-Texas, attacked the nationwide disruption as "completely unacceptable" and "the latest example of dysfunction within the Department of Transportation."

He also alluded to possible congressional action, saying "the administration needs to explain to Congress what happened" and that congress should "enact reforms in this year's FAA reauthorization."

FAA has been operating without a permanent leader

The national aviation agency has been acting without a permanent head since March, when a Trump appointee, 

Stephen Dickson, stepped down halfway through his five-year term.

President Biden's nominee to lead the FAA, Phillip A. Washington, has yet to receive a Senate confirmation hearing. The CEO of Denver International Airport, Washington has a limited resume in aviation but was noticed for helping to steer the Denver Airport's pandemic recovery, 

Biden renominated Washington for the role

 as the new Congress was established last week. In the interim, the FAA is being led by the agency's top safety official, Billy Nolen.

It was just a few weeks ago that the FAA was responding to another barrage of flight delays and cancellations, 

caused at first by a string of brutal winter storms 

during the busiest holiday travel season but then by a logistical nightmare at Southwest Airlines.

Citing staffing shortages and an outdated computer system, 

 over a 10-day period, leaving passengers, airline staff and mounds of baggage in limbo.

Wednesday's ground stop came amidst a slower midweek travel period. 

Data from the Transportation Security Administration

 shows 1.6 million people went through airport security checkpoints Wednesday, down from 2.4 million on Dec. 29. 

Nationwide flight halts are relatively rare

It may have even been the first time the FAA grounded all U.S. flights since 9/11, according to unconfirmed comments including from Republican 

There's been at least one other notable nationwide halt, though that one wasn't for safety reasons: A strike by thousands of air traffic controllers in August 1981 temporarily grounded about 35% of the nation's 14,200 daily commercial flights, 

Sept. 11, 2001, was the first time in U.S. aviation history that the FAA put a ground stop on all traffic, which it says it did to prevent any further hijackings. 

, just after 9 a.m. ET, it issued a ground stop to all traffic that would encounter New York airspace but hadn't yet departed. Within an hour it had closed all U.S. airspace.

That halt lasted for more than a few hours, or even a full day — it wasn't until 11 a.m. ET on Sept. 13 that 

 to U.S. air carriers, provided airports had implemented new security measures.

Catch up on how the events unfolded via our 

Transportation

Emily Olson

Author

Rachel Treisman

Departures across the U.S. were halted for two hours Wednesday morning after the FAA's system for alerting pilots and airports of real-time hazards went dark, frustrating thousands of travelers.

Flight cancellations and delays pile up after an FAA safety system outage

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