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:
Police hunt pub spitter - do you recognise him?
Collection for Myanmar earthquake victims this weekend
Child sex images investigations to get AI help
FOI request shows overcrowding at prison
Hiring advisors will save health money, says minister
Dozens of extra salt bins this year, says minister
No data on minimum wage earners, says minister
Foodbank looking for volunteers
