Question for B Sousa
I seem to recall that under Part 61 and Part 91 in the USA (I am going back 10 years), not only were certain operations such as parachutist dropping, glider towing, banner towing and close proximity (25NM's??) sightseeing flips allowed to be flown by PPL's, but the aircraft did not have to be certified but could be ex-military or experimental. Am I correct and do these rules still apply? I seem to recall "B" model Hueys, old warbirds and various other interesting machines being flown at Quincy, Illinois during the annual World Freefall Convention.