FILE - In this Wednesday, Aug. 8, 2012 file photo, workers at the California Science Center in Los Angeles, clean windows in front of the temporary home for the space shuttle Endeavour prior to a news conference. At sunrise Monday, Sept. 17, 2012, the spacecraft will depart NASA's Kennedy Space Center for California, with stops in Texas. The retired shuttle will be bolted to the top of a modified jumbo jet for the four-day trip to Los Angeles. (AP Photo/Richard Vogel)

Associated Press
FILE - In this Wednesday, Aug. 8, 2012 file photo, workers at the California Science Center in Los Angeles, clean windows in front of the temporary home for the space shuttle Endeavour prior to a news conference. At sunrise Monday, Sept. 17, 2012, the spacecraft will depart NASA's Kennedy Space Center for California, with stops in Texas. The retired shuttle will be bolted to the top of a modified jumbo jet for the four-day trip to Los Angeles. (AP Photo/Richard Vogel)
FILE - In this Wednesday, Aug. 8, 2012 file photo, workers at the California Science Center in Los Angeles, clean windows in front of the temporary home for the space shuttle Endeavour prior to a news conference. At sunrise Monday, Sept. 17, 2012, the spacecraft will depart NASA's Kennedy Space Center for California, with stops in Texas. The retired shuttle will be bolted to the top of a modified jumbo jet for the four-day trip to Los Angeles. (AP Photo/Richard Vogel)
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