Space shuttle Endeavour sits atop the shuttle aircraft carrier flies over downtown Austin, Texas early Thursday, Sept. 20, 2012. 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/Statesman.com, Alberto Martinez ) MAGS OUT; NO SALES; INTERNET AND TV MUST CREDIT PHOTOGRAPHER AND STATESMAN.COM

Associated Press
Space shuttle Endeavour sits atop the shuttle aircraft carrier flies over downtown Austin, Texas early Thursday, Sept. 20, 2012.   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/Statesman.com, Alberto Martinez )  MAGS OUT; NO SALES; INTERNET AND TV MUST CREDIT PHOTOGRAPHER AND STATESMAN.COM
Space shuttle Endeavour sits atop the shuttle aircraft carrier flies over downtown Austin, Texas early Thursday, Sept. 20, 2012. 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/Statesman.com, Alberto Martinez ) MAGS OUT; NO SALES; INTERNET AND TV MUST CREDIT PHOTOGRAPHER AND STATESMAN.COM
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