My friend and I also went to the Paris air show in 1973.
I remember we were delayed for 2 hours due to slots into Le Bourget.
They initially kept us all on the a/c, but they eventually let us out and allowed us onto the apron next to the Tristar. I think they got fed up of all 400 of us getting up and running to one side of the a/c every time something taxied past!