I can take you back to Summer 1999 ATUK:
Charter aircraft based were 1 x AIH A320, 1 x AMM 757, 1 x FCL 757, 2 x BY 757
Several W patterns from CKT, MON and a lot of away-based aircraft from Cronus, Translift, Onur, Istanbul Airlines, Futura, EuroCypria and Air Malta - most of the Translift, Cronus, Caledonian flying was to Greece.
There were four weekly Orlando charters - one Britannia 767, two Air 2000 767s and one Airtours 767, each positioning in and out for the job!
Air Transat YYZ is one loss on long-haul.
On short-haul, if you assume easyJet is a modern-day replacement for Brymon on Bristol and for Gill on Belfast International; Eurowings has replaced the Gill Dusseldorf service; AF and KL services have changed hands but broadly still there, the big changes are:
LGW CityFlyer ATR72 5 x daily gone
STN Air UK Fokker 50 3 x daily gone
BHX Maersk Air J41 4 x daily gone
OSL daily Braathens 737-500 gone
SVG 2 x daily Braathens 737-500 now one ERJs with Loganair
BRU 4 x daily Sabena Avro RJ85 now two ERJs with Loganair
BHD service gone (was Gill Air)
CPH service gone (was a Brymon Dash 8 that year)
LHR had 4 x BA 757s and 2 x A320s so more capacity than today
Quite a lot of big hits there in terms of route losses.
Before anyone gets too depressed, remember this was the year at TeesSide with a based Airtours A320, five British Midland 737s a day to Heathrow, Gill Air services to Paris, Manchester, Belfast and Aberdeen, an Airtours 767 to Orlando and lots of other charter stuff with Britannia, British Midland high density A321s, Spanair, Onur Air and more. You'd never believe it to look at it now....