The Tristars were a bit tight on the taxiway,and really tight on stand.I think they had trouble guiding it in,and the rear RB211 was well over the vehicle road.As for airfield performance it seemed far better than a lot of BA's fleet at the time.The Tridents, and BAC1-11 could be marginal in and out of Dyce.I think also that the Tristar came up on a Friday teatime,which was peak time but it was more an aircraft scheduling problem.Maybe they needed all the others on the shuttle routes.Anyway a nice aircraft to fly in.