Flights run by Aer Lingus between London's Heathrow Airport and Belfast City Airport are being suspended at the end of the month.
The Irish airline is in talks with the relevant authorities to try to re-establish the service, which will be suspended by October 31.
The suspension of services is reportedly a consequence of changes brought in after Brexit the trade union Fórsa, which represents some staff for Aer Lingus, claimed.
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It said Aer Lingus will stop flying the route because its Air Operator Certificate (AOC) expires at the end of October.
Its sister airline, British Airways, will take over the service during the winter months, operating three flights a day.
A UK Civil Aviation Authority spokesperson said that all UK-based airlines had to fly under UK operating licenses after the country left the EU.
Aer Lingus's UK branch had been allowed to fly the route on a wet-leased capacity arrangement from its parent company, the Irish airline, Aer Lingus, the authority said.
The CAA spokesperson said: “We’ve been flexible with Aer Lingus to find a sustainable solution which satisfies both the requirements of the UK-EU Trade and Cooperation Agreement that no longer relies on the wet-leasing arrangements.”
Fórsa union official Eugene Gargan said the move would also have significant consequences for those staff who had worked on the flights.
“The cabin crew in Belfast were offered the option of redeployment to Manchester or Dublin, or to other duties in Belfast," he said.
"Of the 30 crew based there, 13 will be redeployed to customer support in Belfast, 14 will redeploy to the airline’s base in Dublin, and three have opted to avail of a period of unpaid leave.
“These are a group of workers who have helped the company establish a prosperous route between Belfast and London.
"As a consequence of the disruptive effect of Brexit on integrated flight operations across Europe, the crew have lost remuneration, absorbed increased working costs and endured disruption to their home and work lives."
The airline said it was working to try and resolve the issue and was hopeful a resolution could be reached.
“Aer Lingus is very keen to continue operating the Belfast City - Heathrow London service, which we have been operating since 2007," a spokesperson said.
"We are engaging with the relevant authorities in order to allow us to continue to serve this route into the future.
"For the upcoming Winter season we will be working with our sister airline, British Airways, to ensure there is continuity of service and no impact to any of our passengers journeys."
Belfast City Airport has been approached for comment.
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