Airports around the world have been hit by serious computer problems that are causing flight delays. At this time, it appears that the problem was the Amadeus Altea computer system. Among the airports that were hit are Regan National in the U.S., Heathrow and Gatwick in the U.K., Melbourne Airport in Australia, and O.R. Tambo Airport in South Africa.

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Some airports are telling media outlets that they were able to quickly get the check-in computer system back up, but passengers in some airports are still reporting long delays via Twitter. The Amadeus Altea check-in system is used to check in passengers and their luggage. Passengers whose flights were disrupted by the computer problems reported hours-long delays and tweeted photos of very long lines at airports around the globe.

A spokesperson for Amadeus told the BBC that they experienced “a network issue that caused disruption to some of our systems.” The spokesperson said they quickly identified the problem and restored services as fast as possible, but they continue to work on the issue “with services gradually being restored.” At this time, the cause of the computer glitch is unclear, so we don’t know whether it’s the result of a cyber-attack or something else.

Officials at Gatwick Airport described the problems as “a momentary IT glitch” that didn’t cause flight delays, while Heathrow Airport told The Independent that it caused only “intermittent” problems.

Among the airlines that seem to be having computer problems are British Airways, Southwest, Air France, Qantas, Lufthansa, China Air, Korean Air. It’s unclear whether all of these issues are with the the Amadeus Altea computer system or whether these airlines use different systems.

The affected airports include: Heathrow and Gatwick in London, Reagan National Airport in Washington, D.C. Zurich, Paris’ Charles de Gaulle Airport, Haneda/ Tokyo International Airport, Changi Airport in Singapore, O.R. Tambo International Airport in Johannesburg, Melbourne Airport, Frankfurt Airport.

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