Slightly "bending" the topic
I remember chatting to the BA Bac111 "display pilot", and he was chafing at the bit to do a Barrel Roll during a display
The thought being that it was, and I quote him here...
"A positive G manoever, at less than One G"
Or, the Pax would know nowt, until the peeps on the ground showed them the photies
The B707 did it......as did the Vulcan.....
It can't be any worse than trundling over the Alps at 17000ft in a DC7C
we aim to please, it keeps the cleaners happy