Pedantic, I know, but in the case of Edinburgh airport (and many others) they make money by renting/leasing out land to car park operators. Most of the car parking at Edinburgh is run by third-parties.Of course whatever an airport operator may say in public, I suspect most have little interest in significant mode shift to rail for surface access as they make so much from parking, especially shorter term business oriented provision.
If there was a huge modal shift away from driving, I'm sure the airport would be just as happy to rent/lease the land to someone else for another purpose.
