Amadeus says a major system failure which is understood to have affected thousands of passengers on Monday has been rectified.
The outage lasted a number of hours and hit passenger self check-in and reservation systems, agency bookings as well as airport counter systems.
Reports say British Airways, Qantas, Iberia and Cathay Pacific are among the airlines hit by the system failure.
In short: it could be the double whammy of a distribution service and airline IT collapse.
At around 2000 CET (1300 EST), Amadeus released a statement to 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."
Amadeus says a detailed explanation as to what happened and which airlines were affected will be released in due course.
The problem is the second in as many months for Amadeus, after seeing Qantas hit by a major outage in December when passengers were unable to check-in with the airline for a number of hours in December last year.
More to follow...
NB:Image via Shutterstock.