The space shuttle Discovery is shown attached to a modified NASA 747 aircraft at Kennedy Space Center in Cape Canaveral, Florida April 16, 2012. Discovery is expected to be flown to its final home at the Smithsonian National Air and Space Museum Steven F. Udvar-Hazy Center in Chantilly, Virginia on April 17. REUTERS/Joe Skipper (UNITED STATES - Tags: SCIENCE TECHNOLOGY TRANSPORT TPX IMAGES OF THE DAY)