Am I right in thinking that a few overseas destinations for Ryanair & easyjet use airports that are miles away from the city they are there to serve? I think that as long as the same places were not flown to from Edinburgh, then Leuchers could work. Having an airport dedicated (maybe at first!) to one airline could be more attractive to passengers, and with lower landing fees can help keep fares down. I know of many people who travel to Prestwick
from Aberdeen to jet off. Even a local school party bussed it to PIK to fly to Stansted, then out to Aarhus.
I don't beleive Dundee is an option. According to the AERAD chart infront of me (dated dec 01), it's runway is 4593 feet.