The Minister for Foreign Affairs said she is in ‘constant engagement’ with airlines.

On Tuesday evening, Brussels airport and several other Belgian airports had to halt inward and outward flights for several hours due to reports on drones.

Tánaiste Simon Harris admitted it is ‘a real challenge’ to know what is being flown through Irish skies.

Manna has made an application to run a drone food delivery service for the Tallaght area.

Some flights which were reported to have carried munitions through Irish airspace were not in breach on international law, Eamon Ryan said.