This will be tricky because I don't have much info, except a description of an early scene (perhaps the opening) of the film...
A group of people are aboard a small airplane, flying (if memory serves) to an island. The pilot is a guy, and a beautiful woman (a redhead, I believe) sits in the co-pilot's seat. After a little banter, the girl leans over and starts to give the pilot a blowjob, right there in full view of the rest of the passengers. As she's going down on him, the pilot makes the plane swerve up and down erratically, scaring the hell out of the other passengers.
Unfortunately, that's all I remember about the film. No star names or anything. Just that one scene. Does anyone here have any idea what movie this is? Thanks!