We flash back to the customs interview where Laura finds the real question is how did she get to Hell in the first place. Laura begins to explain, and we flash back to San Francisco International airport.
Laura is put on a flight along with three terrorists. On the plane she wrestles with them and their bomb goes off blowing up the plane and sending them all to Hell.
She finds herself in a waiting room in hell. Through a series of misunderstandings, she winds up in the back alleys of Hell.