One of the many things I learned when I dated a stewardess (ahem) was that you "can't die in the air". That is, if you die on a plane (i.e. of something while you are flying, not obviously a crash), you are not "officially" dead until the plane lands somewhere. This way your death certificate will list a place of death as an actual location and not in the air over some random body of land.
I just remembered this when I was reading the Drudge link to several people dying this weekend while on airplanes.