There were at least three major airlines in the United States based today after computer systems collapsed.
Delta, United and Southwest Airlines said the "wide-ranging system cut" affected every journey 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 aircraft for up to two hours.
Airlines were hit by problems with the Aerodata design software, which calculates aircraft weight and balance, according to the Federal Aviation Ministry.
Southwestern Airlines told a passenger who was tweeting about a delay in Nashville: "We are working through some Tech related issues and we will get you on your way as soon as possible.
"It affects our flight system widely, and we're working to see if any other carriers are affected this morning as well."
Delta told a leaflet based on Raleigh-Durham airport in North Carolina: "We are currently experiencing a Wider Crisis System we are working diligently to ensure it is up and running.
"We don't have a specific time yet."
Katie Shehan, trying to go from Knoxville to Chicago, has tweeted it to United: "You probably have your system down – nobody can leave without paperwork. Pleeeeease repaired."
United replied: "We seem to be experiencing a break affecting our ability to create release paperwork. T
"We know that this is frustrating, and we will help you in the air as fast as possible."
It has to be included in our DEATH
A bus fire kills 20 as passengers carrying FUEL are caught on the top deck
Ant and Dec launches £ 7.5m court battle after Algarve villa resort goes to the wall t
Maddie McCann's case could be blown out by new DNA testing, specialist claims
4 have died and 15 in intensive care after a food poisoning outbreak in a care home
DISTRIBUTED IN DOWN
The rapist Nipsey Hussle, nominated by the grammar, shot dead as Rihanna and Drake paid tribute
Passengers said there was also disorder at Atlanta and Boston airports among many others.
Lauren Luna, who was detained in Orlando in Florida, said: "Our gate told us that it was a FAA cut affecting all airlines."
The FAA had tweeted: "A number of U.Services are experiencing computer problems this morning.
"" Please contact your airline directly for flight information and updates. The #FAA doesn't cancel flights. "
American Airlines said the problem was "affecting some of our regional carriers across the country".
Alaska Alaska Air Group also said it was experiencing a whole system break.
It is understood that the airlines have purchased the software from the same developer.
Last week several airlines had problems with another software company using it for tickets and bookings.
More to follow … t
We pay for your stories! Do you have a story for The Sun Online news team? Email us on [email protected] or call 0207 782 4368. You can find WhatsApp on 07810 791 502. We also pay for videos. Click here to upload yours.