I reckon it would largely depend on the individual’s will to survive. Some have a stronger survival instinct than others. I remember that German case Veronica, quite chilling what he did.
I checked up on that Owen, and from what I can find, it appears to be a mixture of Beethoven, Grieg, and Tchaikovsky played through that particular scene.
I don’t think one can last 3 months with no food. It may be possible, but remembering hunger strikers like Bobby Sands ( IRA ), I think human beings really suffer after about 2 weeks. I think you can die after about 6.
If you had been in this plane crash situation, and you’d severed an arm or a leg, and your wound was healing up etc, would you eat you own leg or arm in preference to someone elses?