United Airlines said on Wednesday it was forced to ground all its flights around the world due to computer problems.
About 3,500 flights around the world were affected, the US-based carrier said.
"We experienced a network connectivity issue this morning. We are working to resolve this and apologise to our customers for any inconvenience," the airline said in a message posted on its website.
The Federal Aviation Administration, meanwhile, said United's flights were grounded at 8 a.m., Efe nbews agency reported.
"We are recovering from a network connectivity issue this morning and restoring regular flight operations. We have a waiver available at united.com for customers who are able to change their flight plans," said an United Spokesperson.
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