There’s a custody war brewing between interested parties over NASA’s space shuttle Discovery when it finally returns to Earth tomorrow for the final time. Houston’s Johnson Space centre, New York City’s Intrepid Sea, Air and Space Museum, Seattle’s History of Flight Museum, Florida’s Kennedy Space centre, L.A.’s California Science centre, Dayton’s Museum of the United States Air Force and D.C.’s National Air and Space Museum are among 21 institutions vying to care for the shuttle once it’s retired. The cost? $US28.8 million.