And I'm right in the middle with 4 airports within a 90 minute drive, though MME is more of an airstrip these days. You also need to factor in things like car parking charges, where NCL is cheaper than EDI and a lot cheaper than GLA. layz is right that NCL management is worried about the APD issue, mind you they have always moaned about APD. On the other hand they directly control the parking fees for 80% of the airport's car parking spaces, more than GLA and EDI, so there are some remedies in their own hands. [And I've spent another evening shoving out Better Together leaflets, just for the record.]