Agreed, back copies of Airport Timetables UK (published by Airtime Publishing) will be your friend on this one. You can see exactly who flew what to where, and in the early days such as the 1987 first season for Air 2000 up until the early 90s (if I remember rightly) then it also told you the tour operators who had chartered the flight. Some real trips down memory lane reading that! Redwing, Miss Ellie's World Travel, Marshall Sutton, Manos, Avro, Albir Travel, Kosmar, Grecian, Cypriana, Whitehall Leisure,, Barwell Travel, Charter Centre.....there were dozens on dozens. You'll often find a copy floating round the enthusiast sales - I've got the whole lot from about 1980 to 1995 stashed away but not an easy format to reproduce.