Rallye Driver,
I wasn't present on Sat or Sun, but I'd agree that a minute silence would've been appropriate. On the same day that David Moore died at Woodford in '92, there was a minute silence before the show restarted, and the Red Arrows display was dedicated to David's memory. To this day, I still remember how moved I was by the total silence of the thousands in the crowd, and how much more appreciative I was of the Reds display given the risks they take when displaying for us.
On the other hand, the organisers at Duxford may be forgiven if they felt that it was not appropriate at the time.
Eyes.