Copenhagen Airport, the busiest in the Nordic region, reopened early on Tuesday after drone sightings halted all take-offs and landings for nearly four hours, the airport said.
Delays and some cancelled departures would persist and passengers should check with their airlines, it added.
Police said on Monday that two or three large drones had been seen flying in the area, leading to all traffic at Denmark’s biggest airport in Copenhagen being closed.
The airport halted operations at 8:26 p.m. (1826 GMT) on Monday, according to flight tracking service FlightRadar. Around 50 flights were diverted to alternate airports, FlightRadar said on X.
Earlier, an airport spokesperson said that police were working to identify the drones but declined to provide further details, citing the ongoing investigation.
Last Friday, hackers targeted check-in and boarding systems provider Collins Aerospace, owned by RTX, disrupting operations at London’s Heathrow – Europe’s busiest airport – as well as Berlin and Brussels airports.