Anyone who has attended the Leuchars airshow will know how "easy" it is to travel to. From Edinburgh Aberdeen or Glasgow, it is a non starter, so don't insult us with your "Edinburgh Leuchars" nonsense Mr O'L.
From Dundee, it is feasable. Twenty minutes in a car. Dundee people don't seem too keen on using Dundee airport though, so they may have to run a bit of a loss leader to build up the business from that city.