Many moons ago (early 80s), before BA changed it's policy on air show appearances (barring Concorde, of course!) I was peripherally involved in displaying a BAC 1-11 at a couple of shows in the north of England, Blackpool springs to mind.
Not only did we have pax on board but they were charged for the privilege - 20 pounds I believe. - paid for the fuel.
The display had to be approved in advance by the CAA and a ceiling was set on the lowest altitude to be flown, 500 or 1,000 feet I think.
The pax loved it of course, they were all enthusiasts and we carried a third pilot who was continually on the PA briefing them on what was going to happen. The cabin crew were in the cabin for the whole display facing the pax and my abiding memory was of them being on their knees before the pull up which no doubt was no more than 1.5g!
Happy Days.