Passenger watchdog Travelwatch says it's concerned about the future of some of the routes lost after the liquidation of Citywing.
Last week the company announced it would cease trading after its operator Van Air was grounded by the Civil Aviation Authority.
Eastern Airways has taken on the Newcastle and Belfast City routes and airport bosses say they're looking for companies to fly the other lost routes.
But Terry Liddiard of Travelwatch says some routes may be difficult to sell to incoming airlines:
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