I bagged a flight in Excalibur A320 G-OEXC on 06.02.93, LGW-GVA and can still remember being impressed how modern and comfortable it felt compared to the classic Boeing, Douglas and 1-11 aircraft that had ferried me around Europe up to that point
As an aside 'XC then spent her career with Airtours International (already noted), Premiar and My Travel AS (both Denmark), Air Belgium and then Pacific Airlines and Balkan Holidays (both Bulgaria)
British Airways can be added to the list as they regularly ran charters, oddly out of LHR, in the pre-covid days in their A319, 320 and 321's