All those on board perish. After seeing this, I think I'd rather drive to Dallas the next time. Weeks later, the high school is still mourning the victims. One by one, the survivors of the plane disaster begin to expire. That's a mild way to put it.
Vicious murder is more apropos.
Alex puts two and two together and realizes that the brutal deaths are taking place in the same order as the seating chart on the ill-fated flight. However, when a flying license plate decapitates one guy, that was enough for me. I went home to listen to some John Denver records to clear out my senses.