For me it would have to be Middle Wallop about 1988(ish).
Everything including a low centre line fly past by Concorde, 9 Spitfires all in the air together, a Vulcan with bomb bays open to the mandatory Red Arrows.
The highlight had to be the "sudden" appearrance in the distance of a massed flight of different Army Helicopters that advanced in line to the music of the March of the Valkeries.
.
And Gary Numan was also there in his whatever.
NBF9