Space Shuttle Endeavour mounted on NASA's Shuttle Carrier Aircraft, flies past Transamerica Pyramid on Friday, Sept. 21, 2012, in San Francisco. Endeavour is making a final trek across the country to the California Science Center in Los Angeles, where it will be permanently displayed. (AP Photo/San Francisco Chronicle, Carlos Avila Gonzalez)  NORTHERN CALIFORNIA MANDATORY CREDIT PHOTOG & CHRONICLE; MAGS OUT; NO SALES. Photo: Carlos Avila Gonzalez, Associated Press
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