Producer and Rebel Rock label founder Jim Jonsin has explained that B.o.B's "Airplanes" was originally meant to be a Lupe track. He nabbed it for Bobby, and the song ended up being a smash hit. There was some doubt as to whether a Lupe version actually existed, and then this surfaced. Check out Lupe Fiasco's interpretation of "Airplanes".
Lupe Fiasco f/ Hayley Williams "Airplanes"