Ever wonder what happens to aircrafts at the end of their useful life? They are sent to aircraft graveyards. The Arizona desert is home to several aircraft graveyards. Planes that are no longer in operation are parked there. The Applied Research Institute at the University of Illinois at Urbana-Champaign is hoping to give these planes a new lease on life by recycling the aluminum alloys (principally the high-end AA7075) that are used to build these planes.