3Reds. You were not mistaken. An Air 2000 B757 did appear at the show one year, I was there in the VIP enclosure. It's appearance at the show was kept a secret until the very last minute but a few guys picked up the call sign on their scanners and figured out that something special was about to happen. I think it was flown by Capt Bob Screen but I can't remember which 757 it was although I think it may have been OC. He did a high speed pass throttles open, another high speed in idle (spooky) and a slow pass in landing config before a final high speed pass. I recall the aircraft pulled up into an incredibly steep climb after it's final pass and you could hear the crowd gasp as it disappeared into the clouds.
The ATC guy for the day used to be a guy named Brown? who was a Manchester Airport controller I think? a great guy.