This info is from the financial year 2002/2003 but shows that Luton Airport Parkway was the 173rd busiest station in the UK out of 2496 stations and ahead of airport stations like Manchester but far behind Gatwick and Stansted. Not bad seeing that the station was then only 4 years old.
http://www.sra.gov.uk/pubs2/performa...stat_usage.exc
Future plans for this station include some sort of monorail/ people mover which will terminate on the opposite side of the tracks to the existing station. I don’t know what happened to the trial using bendy busses which in my eyes was a big success as the existing buses just can’t cope with demand.