Flights in Scotland are being delayed because of an air traffic control problem.
Air traffic control company Nats said there has been a technical issue at the Scottish Air Traffic Control centre at Prestwick.
A spokesman for Edinburgh Airport said: "Due to an ongoing issue at the Scottish Airspace control centre, there will be a delay to all flights this morning. We are still assessing the situation but customers should expect delays."
Nats said: "We have had a technical problem overnight with interference on some radio frequencies that we use to speak to aircraft.
"It only affects part of Scottish airspace and flights from some Scottish airports this morning may be delayed as a result.
"We have identified the cause, isolated the problem and the situation is improving.
"We apologise sincerely for any inconvenience."
A spokesman for Aberdeen Airport said a small number of delays were affecting southbound flights but it was hoped they would be back to normal "as soon as possible".