Historical version 6 of Luton Airport (view current version)
Luton has had an airport for some years; however, in the mid 1990s BAA (the British Airports Authority) renamed it to London Luton and claimed it was "London's Fifth Airport". Most people have not fallen for this.
I'd disagree... several budget airlines fly from Luton is which is getting more popular, especially given that it is much closer than Stansted Airport. --Dave
Luton has a single runway (08/26) of 7086 feet, with a terminal area to the north. Club and recreational flying are permitted.
Luton is not on the Tube, but trains run from London Bridge Station along the Thameslink line to Luton Airport Parkway (where there is a shuttle bus to the terminal), taking about half an hour from King's Cross St. Pancras Station.