Momentary thread drift, but concerning getting things out of aircraft in flight:
Periodically skydivers are approached by families to spread the ashes of their loved ones.
A mate of mine has been tapped several times, and the first thing he learned was not to take the lid off in the aircraft, or the result is that part at least of the deceased remains in the aircraft where he/she/it circulates rapidly in the blast from the door, generally coating everything and especially hanging up in any beards or hair the pilot may have.
The second thing he learnt, however, was to loosen the lid before you go: on this occasion he was asked to scatter the ashes of a fellow skydiver, duly left the aircraft with the lid on at 8,000ft, then wrestled with it for over 6,000ft before giving it up as a bad job and opening his canopy. The container continued in freefall, and went into an adjacent golfcourse. Where try as they might, the entire crew at the jump club were unable to find it, so it's out there somewhere still. Fortunately, the wife of the deceased felt the deceased himself would have seen this as a most excellent joke, so she went home happy.........)