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Rep. Carlos Gimenez, R-Fla., discusses government spending as the White House announces $1 billion for airport upgrades and airlines struggling to meet travel demand.

The U.S. Federal Aviation Administration is suffering a nationwide technical outage resulting in hundreds of canceled flights Wednesday morning.

The outage comes as a result of the failure of the FAA's NOTAM (Notice to Air Missions) system, which alerts pilots and other personnel about airborne issues and other delays at airports across the country.

"The NOTAM outage continued with no current estimated time of restoration," the FAA website stated Wednesday morning.

"The FAA is working to restore its Notice to Air Missions System. We are performing final validation checks and repopulating the system now," the FAA said in a statement.

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Delta Air Lines passenger jets rest on the tarmac at Boston Logan International Airport, in Boston. (AP Photo/Steven Senne, File / AP Newsroom)

"While some functions are beginning to come back online, National Airspace System operations remain limited," the statement continued.

While the FAA has not enforced a grounding of aircraft due to the outage, most airlines have chosen to ground their own craft due to the system's failure. The failure has so far resulted in some 400 canceled flights across the U.S., according to FlightAware.

The tracker also showed that more than 1,150 flights within, into or out of the U.S. were delayed.

United Airlines announced its decision to ground all of its aircraft until 10 a.m. ET due to the outage.

The incident comes roughly a week after an air traffic issue prompted the FAA to slow all flight traffic in Florida earlier in January. That failure involved the En Route Automation Modernization (ERAM) at airports across the state.

SOUTHWEST AIRLINES FLIGHT DIVERTED TO MILWAUKEE DUE TO 'POTENTIAL MECHANICAL ISSUE' AMID CANCELLATION CHAOS

Aircraft grounded at the Airport, sunrise (iStock / iStock)

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The earlier January incident affected Southwest Airlines in particular, leaving many travelers stranded without their bags.