By bizn_fun 
Brussels Airport said manual check-in would continue on Sunday and that extra staff had been drafted in to help minimise disruption.
It said 44 departing flights had been cancelled so far on Sunday, and that it anticipated long queues at check-in and further delays.
Europe’s combined aviation safety organisation, Eurocontrol, said airline operators had been asked to cancel half their flight schedules to and from the airport until 02:00 on Monday due to the disruption.
Meanwhile, Dublin Airport said that while the technical issues persisted and some airlines were continuing to check in manually, it was expecting to operate a full schedule on Sunday.
A spokesperson told the BBC: “Passengers are advised to contact their airline directly for updates on their flight.”
Dublin Airport previously said that Cork Airport, which is owned by the same parent company, had experienced a “minor impact” from the cyber-attack – but Cork Airport has since said it has faced no disruption with all services operating as normal.
Berlin Brandenburg Airport is asking travellers to use online or self-service check-in instead of the desks while the outage is ongoing.
It said there had been 12 cancellations in and out of the airport on Saturday, but that delays were generally less than 45 minutes.
EasyJet and Ryanair, which do not operate out of Heathrow but are among Europe’s biggest airlines, said on Saturday that they were operating as normal.