Flights in and out of Glasgow airport were stopped for about 30 minutes due to staff shortages.
Ten outgoing flights were delayed with a number of incoming flights landing early, before the closure began just after 09:00.
The National Air Traffic Control Service (Nats) said the closure was due to late notice staff shortages at Glasgow air traffic control tower.
A spokeswoman apologised for the inconvenience caused.
However, she said there was “no alternative” but to stop flights.
The last departure before the airport closed was at 08:45.