Air traffic control for five Scottish regional airports is to be undertaken centrally from Inverness, Highlands and Islands, Airports Ltd has announced.
The move involves Sumburgh, Dundee, Inverness, Kirkwall and Stornoway.
Hial said the change, which would be phased in, would modernise air traffic control.
But the union Prospect said the plan puts 60 jobs at risk and described it as “poorly thought through”.
Unmanned towers would feed information to a new combined surveillance centre at New Century House in Inverness.
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Stuart Nicol
The changes will see the level of air traffic service at Benbecula and Wick John O’Groats downgraded to that currently used at Hial airports in Campeltown, Islay, Tiree and Barra (pictured).
Prospect said the proposals also involve downgrading air traffic services at Benbecula and Wick John O’Groats airports.
The union said the sites would have a flight information service officer service, which would offer pilots information about the condition of the airfields and weather but not the flight paths of individual aircraft.
Prospect negotiator David Avery said: “The proposals to downgrade services at Wick and Benbecula are staggering.
“Within these small communities the loss of even a few jobs like this is the equivalent of losing several hundred jobs in Glasgow and Edinburgh.
“It is inconceivable that such far-reaching changes can be brought in with the paltry level of consultation and transparency we have seen.”
‘Major change’
But Hial managing director Inglis Lyon described the new centre as a “significant step”.
He added: “It will allow us to move forward with planning and procurement of the relevant systems to safely deliver a state of the art air traffic control management system and give additional clarity to colleagues and stakeholders as we deliver this complex and challenging programme.
“Our focus continues to be on aviation service delivery and providing a safe, modern and efficient means of handling aircraft for the regions and the islands in the future.”
Transport Scotland aid the move was part of a wider programme to ensure remote and rural communities “continue to benefit from sustainable air services in the future”.
A spokeswoman said: “We recognise that this is a major change for the organisation.
“Hial has engaged extensively with staff, local authorities and other stakeholders throughout the process and we expect them to continue to engage and consult as it implements the programme.”