Fallout from a cyberattack that disrupted check-in systems at several European airports extended into a second full day on Sunday, as passengers faced dozens of canceled and delayed flights — and the impact poised to worsen for at least one major airport.

This has a large impact on the flight schedule and will unfortunately cause delays and cancellations of flights,” Brussels' airport operator said.

Heathrow was among several European airports hit by delays on Saturday after a cyber-attack affecting an electronic check-in and baggage system. The airport said a number of flights were delayed as a "technical issue" impacted software provided to several airlines.

London's Heathrow Airport and Berlin Brandenburg Airport have also reported issues. Several major European airports are warning of delays and cancellations on Saturday following a "cyberattack." Brussels Airport said in an update on its website that an attack on Friday night had targeted a service provider for check-in and boarding systems,

Heathrow is among several European airports hit by a cyber-attack affecting an electronic check-in and baggage system. The airport warned of possible delays due to a "technical issue" affecting software provided by Collins Aerospace to several airlines.

Fallout from a cyberattack that affected check-in systems at several European airports has extended into a second full day

Heathrow warned of delays for departing passengers and Brussels said it was using manual check-in and boarding procedures. Dublin, Cork and Berlin also reported slowdowns.

Travelers at major European airports including Heathrow, Brussels, and Berlin faced significant delays this weekend following what Collins Aerospace described as a “cyber-related incident.”