Another horrifying detail to consider: it is not unlikely some managed to stow away in the landing gear bay. These bays aren't pressurized, so they would suffer all ill effects climbing to, and cruising at 28,000 feet would do to you.

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These unfortunate passengers would experience a slow death as the temperature and air pressure drops to unsurviveable levels. They would experience extreme altitude sickness due to tissue expansion from the pressure (or rather the lack thereof), and freezing sub zero temperatures. Eventually their bodies would become a macabre battle between low pressure trying to disintegrate them, and ice trying to keep them together. Fortunately (or at least I believe) they would pass out before they feel any of the most extreme effects.

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Perhaps just as disturbing, as the plane reaches it's destination and lowers its' landing gear several miles out from the runway, their bodies would tumble from the plane and shatter like glass on impact with the ground. It is unlikely they would ever be found unless they landed on some part of civilization, and that said there would be no way in hell to identify them.

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I am not in any way a physician or biologist. Much of what I've put here is speculation from relatively hasty research. If anyone sees anything wrong with the conclusions I've come to, I would love to hear it.