Far too radical for Luton, but rather than the naff ness of a bus, or the expense of a spur line, considering the terrain and obstacles between the train station and the airport terminal surely a gondola or cable car would be the way to go if the powers that be are serious in creating an integrated transport system? With a decent transport system far less on site parking would be required and the airport could promote itself as being far quicker into London. I'm sure this idea would be far too radical for Luton!