Gatwick airport, south of London, has resumed its flights after the last suspension, at 17.10 GMT, for the sighting of a second drone, airport authorities have reported.
A spokeswoman for the airport explained that it has been decided to reopen the take-off and landing runway when judging that "the measures in force at the airport offer guarantees that it is safe to reopen."
At 1710 GMT, Gatwick temporarily suspended its flights after having operated normally since 6.30 GMT in the morning, after having suspended all operations on Wednesday night and throughout Thursday for the sighting of a first drone.
During Thursday, some 760 flights remained on the ground, while today 155 have been canceled, affecting more than 100,000 passengers.
According to the BBC, the Police have identified the "suspected suspects" of operating the drones, and it keeps "several lines of investigation" open, including the possibility that it is an environmental campaign.
The first of the drones, industrial type, was sighted on Wednesday at approximately 21.30 GMT, and the second this afternoon.
In the United Kingdom, handling these vehicles near aerodromes is punishable by up to five years in prison.