The KT Tristar fleet ended at the end of October 1999
I was pax on one of those last flights ACE-LGW.
I think because of our weight out of ACE (and it was a warm, nil-wind evening), we had to depart on 21. It was evening rush-hour and we had to wait for lots of arrivals on 03 before we could depart. I remember a nostalgic atmosphere onboard and talking with the CC about that being one of the last flights.
Also flew on a Cally T* LTN-LCA on a Summer's evening in the early '90's. Over 400 pax on board IIRC. I suspect the performance calcs were done very carefully that evening ;-)