Travel agents and airlines using Amadeus were hit by a three-hour crash in the system yesterday.
Thousands of airline passengers were unable to check in online, reserve their seats or buy tickets due to the breakdown.
Amadeus declined to discuss what had caused the problem or say how many passengers had been disrupted by the computer crash.
The company said: “Amadeus can confirm that some airlines are experiencing difficulties with our systems. We regret any delay and inconvenience caused and are fully investigating this issue.”
Airlines reportedly hit by the problem included Oneworld alliance members British Airways, Iberia, Qantas, Cathay Pacific together with Finnair and SAS.
AirBerlin tweeted yesterday: “Because of a technical problem at Amadeus, our booking page is temporarily not available. We will provide a solution asap.”
Airline check-in desks at airports were also hit, resulting in where staff having to manually input passengers’ details rather than scan their passports.
Amadeus said last night: “Amadeus can now confirm that all airline systems are restored.
“Some travel agency customers may continue to experience service disruption which we are investigating. We regret any inconvenience this may have caused.”