An investigation has been launched to identify the cause of a technical issue which led to flight delays at Scotland's main airports.
Edinburgh, Glasgow, Aberdeen and Prestwick airports were all affected by an overnight technical problem at the Scottish Air Traffic Control centre at Prestwick, South Ayrshire.
Nats, which provides air traffic control services in the UK, said there had been interference on some radio frequencies used to speak to aircraft, affecting part of the Scottish airspace.
The airports affected later reported that operations were getting back to normal following the early morning delays.
In a statement, Nats said: "We would like to again apologise for any inconvenience caused to passengers and our airline and airport customers by today's technical problem at Prestwick centre.
"Detailed analysis is currently under way to identify the root cause of the interference on our radio frequencies.
"In the meantime we are now successfully managing normal traffic levels without adding any additional delay to that incurred this morning.
"We expect the operational impact of the continuing investigation to be minimal to the travelling public."
The longest delay so far was for an Eastern Airways flight to Durham from Aberdeen Airport due to leave at 8.20am but estimated to depart at 10.05am.
NATS Prestwick also controls aircraft flying between 2,500ft and 28,500ft over northern England, the Midlands and north Wales, as well as the airspace over the eastern half of the North Atlantic.
We apologise for the inconvenience people may be experiencing and are assisting airlines to minimise disruption. https://t.co/FyvF9Uug8K
— NATS (@NATSPressOffice) October 26, 2015
Glasgow Airport said: "Due to technical issue with air traffic control there may be delays to some flights. Please contact your airline for specific flight details."
Due to technical issue with air traffic control there may be delays to some flights. Please contact your airline for specific flight details
— Glasgow Airport (@GLA_Airport) October 26, 2015
Due to an ongoing issue at the Scottish Airspace control centre there will be a delay to all flights this morning. 1/2
— Edinburgh Airport (@EDI_Airport) October 26, 2015
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".
Gordon Robertson, of Edinburgh Airport, said passengers should consult their airlines before heading to the airport.
He said: "Clearly, if there was an airspace closure as we saw this morning for a period of time that has a knock-on effect through the day and we're working with our airlines to try and understand how that affects flights for the rest of the day and we'll be giving information when we can."
He estimated it would take "hours rather than days" for operations to return to normal.
But he added: "Clearly, with the effect on the first wave today, there are going to be reverberations through the day and passengers should keep an eye on our Twitter feed, our social media, but also talk to their airlines as well.
"I'm sure air traffic control wouldn't allow flights if anything was unsafe so I don't think passengers should be worried unduly."
Scotland's Transport Minister, Derek Mackay said he understood the technical issue has been "rectified and addressed".
He added: "However, there is a knock-on consequence to the airlines so people should check with their airlines and airports to ensure that their flights are running.
"There has been a knock-on impact and a number of flights are delayed but I understand the technical issue has been addressed."
Some passengers took to social media to raise their concerns.
Marvellous, a major malfunction of the air traffic control system in Scotland. Now sat in a plane in Glasgow Airport and can't take off
— Stephen Malcher (@malches67) October 26, 2015
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