Aer Lingus has sold just 176 seats on its Belfast Aldergrove to London Heathrow route for the first month of operation of the new route in January.
A total of 32,364 seats are available on the return route, with three 174-seat aircraft flying three return trips daily.
Ryanair, on the other hand, has managed to sell almost 1,100 seats for its recently-announced service from Belfast City airport to Stansted for the same period.
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