I never saw the movie, but here's the battle report anyway.
There's the plane...
...the inside of the plane... but where's the snakes?
Ah, there they come.
The snakes kill the first passenger.
The kid tries to kill a snake by force-feeding it a carrot. It fails.
The stewardess opens fire, killing a snake. And the kid too.
The snakes attack and kill the last passenger.
The stewardess tries to shoot the snakes, but her gun is too long.
Then she dies.
The pilot decides not to stick around any longer.
He leaps out of the plane.
Without a pilot, the plane crashes and explodes, killing the remaining snakes.
It might have seemed like a crazy thing to jump off the plane, but don't worry; he's got a parachute!
Crap, it was his lunch...
Remus: Harry... I'm a werewolf.
Harry: Are you fucking serious?
Remus: Well yes, but I don't see how that applies here.