An alleged cyberattack at a provider of check-in and boarding systems has disrupted operations at several major European airports, causing flight delays and cancellations.
Heathrow Airport, Brussels Airport and Berlin Airport were affected by the disruption, they said in separate statements on Saturday. Dublin Airport also said it was facing a minor impact from the issue, along with Cork Airport, Ireland’s second biggest after Dublin.
As of Sunday 9 a.m. GMT, 73 arrivals and 58 arrivals had been canceled at Heathrow, Berlin and Brussels since the day before.
Reports said Collins Aerospace’s check-in software had technical problems causing the disruption.
Collins Aerospace's parent company, RTX, said it had become aware of a "cyber-related disruption" to its software at selected airports.
A European Commission spokesperson said there were currently no indications of a “widespread or severe attack” and that the origin of the incident was still under investigation.
Work continues to resolve and recover from Friday's outage of a Collins Aerospace airline system that impacted check-in. We apologise to those who have faced delays, but by working together with airlines, the vast majority of flights have continued to operate.
— Heathrow Airport (@HeathrowAirport) September 20, 2025
We encourage… pic.twitter.com/Y5YNCiOrk2
Systems' experts say these kinds of sweeping outages are typically the result either of ransomware attacks, where online extortionists paralyze corporate networks in the hope of payment, or deliberate digital sabotage.
It is currently peak travel season in Europe.