\"I just spoke with Buttigieg,\" President Joe Biden said addressing the media on the South Lawn of the White House. \"They don't know what the cause is. But I was on the phone with him about 10 minutes. I told him report directly to me when they find out. Aircrafts can still land safely, just not take off right now. We don't know what the cause of it is expected to be able to -- in a couple hours we'll have a good sense of what caused it. And we'll respond at that time.\"

Buttigieg also said there's currently no indication of a cyberattack, but \"we also are not going to rule that out until we have a clearer and better understanding of what's taking place.\"

Republican Sen. Ted Cruz criticized the FAA's management of the system and called for an explanation of issues.

\"The flying public deserves safety in the sky,\" Cruz said in a statement. \"The FAA's inability to keep an important safety system up and running is completely unacceptable and just the latest example of dysfunction within the Department of Transportation. The administration needs to explain to Congress what happened, and Congress should enact reforms in this year's FAA reauthorization legislation. This incident also highlights why the public needs a competent, proven leader with substantive aviation experience leading the FAA.\"

\"PHOTO:
Marco Bello/Reuters, FILE
PHOTO: An aircraft approaches to land at Miami International Airport after the Federal Aviation Administration (FAA) said it had slowed the volume of airplane traffic over Florida due to an air traffic computer issue, in Miami, Jan. 2, 2023.
>
\"PHOTO:
Marco Bello/Reuters
PHOTO: A computer failure at the FAA has the potential to impact flights nationwide, including a possible nationwide grounding on Wednesday, Jan. 11, 2023.
>

Airlines hit with delays, cancellations

In the wake of the temporary nationwide pause, several airlines confirmed they were experiencing delays and canceling or diverting flights due to the NOTAM system outage.

\"We are closely monitoring the situation, which impacts all airlines, and working with the FAA to minimize disruption to our operation and customers,\" American Airlines said in a statement. \"We encourage customers to check aa.com for the latest flight information.\"

The airline had canceled nearly 400 flights and 850 flights have been delayed as of late Wednesday morning due to the FAA system issue, it said.

United Airlines said it has \"temporarily delayed all domestic flights and will issue an update when we learn more from the FAA.\"

\"PHOTO:
Jim Vondruska/Reuters
PHOTO: Passengers wait for the resumption of flights at O'Hare International Airport after the Federal Aviation Administration (FAA) had ordered airlines to pause all domestic departures due to a system outage, in Chicago, Jan. 11, 2023.
>

Southwest Airlines also confirmed it was suffering through delays due to the technical issues at the FAA.

\"Please check your flight status in the Southwest app or website to watch for any flight status changes,\" Southwest Airlines said in a statement released early Wednesday morning. \"If your flight status changes substantially we will message the day of travel contact listed on your reservation by their preferred contact method.\"

Delta said it \"will continue to work with the FAA on strategic delay programs at certain airports throughout the day,\" with 130 flights canceled and another 30 diverted.

\"Potential for additional delays and cancels continue,\" Delta said in a statement.

Several airlines are waiving fees to rebook flights due to the FAA issues, including American, Delta and United.

ABC News' Sarah Kolinovsky contributed to this report.

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