Major airports in Brussels, London and Berlin were hit by disruptions to electronic systems that snarled up check-in and sent airline staffers trying options like handwriting boarding passes.

RTX said on Saturday it was working to fix the issue as quickly as possible, and that the disruption could be mitigated with manual check-in operations. It said the incident had impacted its MUSE ...

Passengers face long queues and confusion at Heathrow Airport after a cyberattack on check-in systems forced airlines to switch to manual processing. The cyberattack that crippled check-in systems at ...