planes and death..

ever wondered what happens when/if someone dies while on a plane journey? well i didn't before yesterday ...on our flight to nyc yesterday, the man in the seat in front of me took a turn, or stroke, and nearly died (his ears went blue, was out/non-responsive, they had to call for a doctor / get oxygen etc and lie him on the ground) .. hence was a somewhat 'different' flight.. thankfully he came round after quite some time but they had the doctors ready at JFK for his arrival..
..but just made me wonder, what would have happened if he had died on the flight?