Several major European airports continue to face disruption following a cyber attack on a provider of check-in and boarding systems.

London Heathrow, Brussels Airport and Berlin Brandenburg Airport were among those to report disruption caused by the incident, which impacted systems run by aviation technology firm Collins Aerospace from Friday evening (19 September) onwards.

The incident forced some airlines to use manual check-in and boarding procedures to process passengers, leading to delays and cancellations over the weekend, with the issues continuing into Monday (22 September).

Heathrow said in a statement: ¡°Work continues to resolve and recover from an 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.¡±

Meanwhile, Brussels Airport warned passengers that delays and cancellations were ¡°expected¡± on Monday due to the cyber incident, with reports that it had asked airlines to cancel around half of all scheduled flights for the day.

¡°Following a cyber attack on the American company Collins Aerospace, the external provider of check-in and boarding systems, there are disruptions to check-in operations at several European airports, including Brussels Airport,¡± said the airport in a statement.

Berlin Brandenburg also advised passengers of ¡°longer waiting times¡± at check-in because of the technical problems.

RTX, the owner of Collins Aerospace, said it was working to resolve the issue as quickly as possible.

"The impact is limited to electronic customer check-in and baggage drop, and can be mitigated with manual check-in operations," added RTX in a statement.