The incident saw its customers suffer severe check-in problems, with both airports and airlines affected, as they sought to reassure customers online.
Many passengers turned to social media to complain or publish their videos of long queues at airports.
An Amadeus spokseperson told TTG: “Amadeus can confirm that our systems are recovered and are now functioning normally. During the morning, we experienced a network issue that caused disruption to some of our systems. As a result of the incident, customers experienced disruption to certain services.
Amadeus technical teams took immediate action to identify the cause of the issue and mitigate against the impact on customers. Amadeus regrets any inconvenience caused to customers”.
The exact fallout has yet to be determined, however one agent has said this IT outage highlights the problem of relying on different technology suppliers. "It really shows how vulnerable airlines are with multiple systems which can affect their operations," said Ashley Quint of TravelTime World.