There is a very large amount of transatlantic air traffic that caters for a lot less than 300-400 passengers as mentioned above. Have a search for the number of fuel stops at Shannon, Wick, Stornoway and Inverness as well as the two Icelandic airfields at Keflavik and Reykjavik. There are a phenomenal amount of new and serviced/ resprayed deliveries each week from Cessna, Gulfstream, Boeing and McDonnel Douglas (USA), Embraer and Pilatus(Brasil), Caanadair, Bombardier and De-Havalind (Canada) of shorter range aircraft that have to make enforced fuel stops along the way as well as Airbus (France) going the other way towards North and South America. The number of small business jet movements has been on the increase every year for the last 20 years.
Marketing would be everything though. Combine a long runway with aa servicing / repair / respray facility and you have a great asset.
Two uk examples - Southend and Bournemouth. Wee seaside towns full of grannies and shops selling pension book covers. Both site have massive aircraft servicing, repair and respray facilities - and queues to get in.





