Problems started about 11:30am United Kingdom time at airports including London Heathrow, London Gatwick, Singapore, Johannesburg, Zurich, Melbourne, Washington and Paris.
Amadeus, which operates global travel booking systems and offers check-in services for airlines, said it suffered a network problem on Thursday which caused a disruption to some of its systems and but had fixed the problem.
The problems were traced back to one software vendor, Amadeus, and its Amadeus Altea check-in software.
Some airlines reported that they were affected by the glitch for a matter of minutes, though it was 3 1/2 hours before Amadeus was able to say that the network was "functioning normally".
London Gatwick airport incident did not cause long delays.
Facing chaos and delays, many passengers took to social media to complain and tweeted pictures of the long lines at airports.
Julia Louis-Dreyfus 'Numb' After Record-Tying Emmy Win The Veep star sang about Trump in show host's, Stephen Colbert, opening song at the Microsoft Theater in Los Angeles, California . She's 56", while another added: " Julia Louis-Dreyfus's insane streak would be infuriating if she didn't 1000% deserve it.
Lufthansa, Air France and Southwest Airlines all reported check in delays due to the outage.
The issue is affecting airlines around the world, including those operating at Heathrow and Gatwick. Technical teams had identified the cause of the outage and restored services, the company said, adding that services were gradually being restored. "Amadeus regrets any inconvenience caused to customers", the spokesperson said.
It declined to comment on whether hackers was behind the problem.
Amadeus competes with Sabre Corp. and Travelport Worldwide Ltd.in booking systems, with the Spanish company claiming a 43 percent market share.
Passengers are seen waiting to check in for flights at London's Heathrow airport in this file pic.
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