The sub-plot of this film is the love interest of Benji, a character shown at the beginning, and his girlfriend, whom he is worried about traveling alone to Las Vegas and has people "bug" her phone in some way before leaving to go. No spoilers, but he really loves her and the film takes an unexpected dark turn at the end about love.—jmacnewman
When terrorists plant a bomb on a commercial flight, the passengers aboard the plane must fight to keep the plane in the air and all the passengers alive: the bomb is rigged to detonate whenever the plane dips below 800 feet.