A book that one would typically buy at an airport that is read just to pass the time on the flight, not because of actual interest.
Examples would most books by James Patterson, Nelson DeMille, and Dan Brown.
Person 1: "Ooh, The Gate House sounds good, my co-workers talk about Nelson DeMille a lot! I think I'll get this one!"
Person B: "That's just an airplane novel, you won't ever touch it again once we get into Chicago."