Paris, Zurich and Frankfurt airports said they had suffered problems with computer systems, but they had been quickly resolved. Amadeus didn't elaborate on what the problem was, but the fact that one software provider could take down the check-in systems of hundreds of airlines shows how vulnerable the worldwide air travel system is to IT problems.
And as Reuters reports: "A similar incident occurred in April, when computer issues briefly prevented airlines including Lufthansa and Air France-KLM, from boarding passengers one evening".
"Altea" software which is used by 125 airlines is responsible for the problem.
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The check-in systems of affected airlines at Changi Airport have been restored after experiencing nearly three hours of technical glitch.
The extent of the outages varied by airline and airport.
The spokeswoman declined to share further details, merely noting "Amadeus regrets any inconvenience caused to customers".
"Due to a technical issue affecting check-in systems of some airlines, the check-in process may take longer than usual".
Thursday's hiccup comes four months after a power loss and computer crash at IAG SA's British Airways led to the grounding of flights for more than 75,000 passengers. The Spanish travel technology provider confirmed there's a "network issue" causing the disruption but insisted "services are gradually being restored".