I heard that this was the biggest military airshow in Europe that year because a horrible crash at the 1988 Ramstein Air Show shut down that show and maybe some others in 1989. (I stipulate “military” airshow because there is huge airshow in Paris each odd year that features military aircraft but also commercial craft, and that show is not exclusively a Ministry of Defense or Department of Defense endeavor.)
Oddly enough there was also a crash at the 1989 Paris Airshow, but it resulted in no loss of life (the 1988 Ramstein crash caused 70 fatalities and several times that number injured.) There was no crash at Mildenhall in 1989 though. I remember the F-18 being about the most impressive thing that flew that year. This, I believe, is a Panavia Tornado, but I’m not that familiar with planes–particularly non-US models–so I could be wrong.