I have read the replies with interest, but dredging my memory, I recall an "incident" at BHX/EGBB in 1969/70 [memory a "bit" hazy] when a BEA Bac11 taxied off stand 6A, the oleoes compressed and the underside of the wing hit the uppr surface of the Bac11s wing on 6B.
Both captains leapt out, hit the wing with their fist[s] and went on their merry way
Would that be "acceptable"today?
we aim to please, it keeps the cleaners happy