At least three major US airlines were grounded today after computer systems crashed.
Delta, United and Southwest Airlines said the "system-wide outage" was affecting all flights across the country.
American Airlines and JetBlue were also affected as passengers said they were stopped at the gate or were left sitting on stationary planes for up to two hours.
Many carriers across the country have been impacted by huge delays. Picture: AFPSource:AFP
Airlines were hit by problems with the Aerodata planning software, which calculates weight and balance on planes, according to the Federal Aviation Administration, The Sun reported.
Southwestern Airlines told a passenger who tweeted about delays in Nashville: "We're working through some Tech related issues and will have you on your way as quickly as possible.
"It's affecting our flights system wide, and we're working to see if it's affecting any other carriers this morning as well."
Delta said to a flyer grounded at North Carolina's Raleigh-Durham airport: "We are currently experiencing a System-Wide Outage we are working diligently to get it back up and running.
"We do not have a specific time as yet."
Katie Shehan, trying to get from Knoxville to Chicago, tweeted to United: "Your system is down apparently — no one can leave without paperwork. Pleeeeease fix."
United replied: "It appears that we are experiencing an outage that is impacting our ability to create release paperwork.
"We know this is frustrating, and we will get you in the air as quickly as possible."
Passengers said there was also chaos at Atlanta and Boston airports among many others.
Lauren Luna, stranded at Orlando in Florida, said: "Our gate just told us it’s an FAA outage affecting all airlines."
The FAA tweeted: "Several U.S. #airlines are experiencing computer issues this morning.
"Please contact your airline directly for flight information and updates. The #FAA does not cancel flights."
American Airlines said the problem was "affecting a few of our regional carriers nationwide".
Canada's Alaska Air Group also said it was experiencing a system-wide outage.
It is understood the airlines bought the software from the same developer.
Last week several airlines had problems with another software company used for tickets and reservations.
This article originally appeared in The Sun and has been reproduced here with permission.
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