BBCEdinburgh Airport has been hit by an IT outage affecting airlines, media and banks around the world.
Departure boards in the main terminal building appeared to freeze before 07:00, showing out-of-date information about gate numbers and take off times.
A fire alarm in the main terminal building also sounded, which is understood to be be connected to the ongoing issues.
Edinburgh Airport said teams were managing waiting times “as best they can” and told passengers not to come to the airport without checking with their airline.
‘Lingering impact’
Glasgow and Aberdeen airports said they had been “largely unaffected”.
However, multiple airports in the UK and across the world have reported delays, with many flights suspended.
Ryanair said it was also experiencing problems and advised passengers to arrive at airports at three hours before their scheduled departure time.
ScotRail said it has not been affected, but other UK railway companies and some NHS services have reported problems.
The cause of the outage is not known, but computer giant Microsoft said its was taking mitigation action to deal with “the lingering impact” of an outage.
Edinburgh Airport said work was ongoing to return airport operations to normal as soon as possible.
In a statement, it said: “Passengers should not travel to the airport without first checking the status of their flight with their airline.
“The wait at security is currently around one hour due to the outage and our teams are managing this.”