I originally heard this idea on one of the various bootleg mashups for purchase sites.  The original was mostly just the Acapella version of Usher's "Daddy's Home" against the instrumental to "Airplanes" by B.O.B verbatim.  This version although quite from perfect as there was no "Studio Accapella" available at the time of this production is now in key.  However, unlike the original mashup, the vocals have been re-keyed to match the instrumental (as perfect as my tools would allow.)  Enjoy!  Hopefully a more DJ Friendly version will be available soon (maybe an instrumental lead-in or acapella lead in.)

Hey Airplanes (Giant G's Refix)

In Common - Adam Randolph Band Live!  At Extreme Pizza Wilmington

DJGiantG