I find your lack of faith disturbing:
I ask Agent the name of the project, what it's about, etc. He says: Snakes on a Plane. Holy shit, I'm thinking. It's a title. It's a concept. It's a poster and a logline and whatever else you need it to be. It's perfect. Perfect. It's the Everlasting Gobstopper of movie titles.
Now out of both loyalty to the sacred bond between studio and screenwriter and also a serious desire to keep getting hired in this town, I will not give away any of the plot details of SNAKES ON A PLANE. But know this. As the great Sam Jackson would say: There are motherfucking snakes on the motherfucking plane.
What else do you need to know? How the snakes get on the plane, what the snakes do once they're on the plane, who puts the snakes on the plane, who is trying to get the snakes off the plane...This is not for you to ponder. There are snakes on the plane. End of fucking story.