More than half of the flights at Brussels Airport were canceled on Monday due to a cyberattack on airline software, causing disruptions that extended to major hubs in Berlin and London.

With Brussels airport in Belgium requesting that airlines cancel over half of their flights on Monday, flight disruptions are expected to extend throughout Europe. Following a cyberattack on Friday that interfered with their automated check-in and boarding software, some of Europe's major airports have been working over the past few days to resume regular operations.

By Sunday, the chaos had subsided somewhat at London Heathrow and Berlin, but aircraft cancellations and delays persisted.

Software vendor Collins Aerospace stated in a statement Monday morning that it was nearing the end of the necessary software changes. Although the service provider is actively addressing the problem, Brussels Airport stated that it was still unknown when it would be fixed.

According to the AP news agency, they have requested that airlines cancel over 140 of the 276 outgoing flights they had planned for Monday.

Heathrow apologized to passengers who experienced travel delays and stated on Sunday that steps were being taken to address the problem. In addition to reminding travelers to check their flight status before heading to the airport, it emphasized that the great majority of flights had continued to run.

According to the BBC, on Sunday, almost half of the airlines operating out of Heathrow were operational again, including British Airways, which had been operating on a backup system since Saturday.

A representative for Berlin Airport told the BBC that it had no idea how long the electronic disruption would last and that some airlines were still manually boarding passengers.

In order to completely comprehend the implications of the event, a representative for the UK's National Cyber Security Centre stated on Saturday that it was collaborating with Collins Aerospace, the Department for Transport, law enforcement, and the impacted UK airports.

Heidi Alexander, the UK's transport secretary, also acknowledged the event and stated that she was keeping an eye on the situation and receiving regular updates.

The European Commission, which is involved in overseeing airspace around Europe, stated that while it was keeping a careful eye on the cyberattack, there was no proof it had been severe or widespread. According to a recent analysis by the French aerospace company Thales, cyberattacks in the aviation industry have surged by 600% in the last 12 months.