In the peak Prestwick had up to 10 based trainers at a time and up to 6 in the circuit at a time.eg 3 BEA 1-11s, 3 BEA Tridents, BOAC 707, BOAC VC10 and whatever. VC10 G-ARVM was a particular resident. Also 3 Court Line 1-11s at a time. BOAC/BA 747s and Concordes. Managed 4 Concordes on the ramp at once, each time one broke they sent another. Fury one night when an RAF Belfast joined the circuit. The Wednesday RAF Britannia, the 3pm RAF Lightning. Fast forward to today and home from home for RAF A330, C17s and Hercs. Ryanair each day this week and often, Jet 2, Monarch and others regular visitors inc the USAF. Something most days. Seems to be slot controlled now with a limit of 2 trainers slots at a time. Can lead to disappointment or delay if you arrive without having booked the slot, the runway being a busy runway with civil, military, light, helicopters et all. This past few months must be the busiest military transit airfield in the country, today 3 USAF, 3 RAF and 3 RCAF.