Great memories from TrapperJ
Looks like your request has everyone stumped.
I was looking though my bookcase today and found squeezed between two books a 1994 timetable for Manx Airlines. In their summer timetable for that year they were operating routes to and from Luton to the Isle of Man, 2 flights a day to Belfast City Airport and a daily service to Kerry. All the Luton flights in that year were by ATP.
I had forgotten about the Kerry service but did Manx ever serve anywhere else from Luton?