LOS ANGELES, CA - SEPTEMBER 21: The space shuttle Endeavour, on top of NASA's Shuttle Carrier Aircraft or SCA, flies over the Griffith Park Obervatory

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SAUSALITO, CA - SEPTEMBER 21: The Space Shuttle Endavour flies on top of a modified 747 jumbo jet over the Golden Gate Bridge and Sutro Tower

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SAUSALITO, CA - SEPTEMBER 21: The Space Shuttle Endavour flies on top of a modified 747 jumbo jet over the Golden Gate Bridge and Sutro Tower

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LOS ANGELES, CA - SEPTEMBER 21: Space Shuttle Endeavour arrives in L.A. over Santa Monica beach

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LOS ANGELES, CA - SEPTEMBER 21: Space shuttle Endeavour, sitting on top of NASA's Shuttle Carrier Aircraft or SCA, lands at Los Angeles International Airport

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LOS ANGELES, CA - SEPTEMBER 21: The space shuttle Endeavour, sitting on top of NASA's Shuttle Carrier Aircraft or SCA, lands at Los Angeles International Airport

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LOS ANGELES, CA - SEPTEMBER 21: Space shuttle Endeavour, sitting on top of NASA's Shuttle Carrier Aircraft or SCA, lands at Los Angeles International Airport

Gabrielle Giffords and husband Mark Kelly watch the Space Shuttle Endeavour travel over Tucson on Thursday.

P.K. Weis/Southwest Photo Bank

Space Shuttle Endeavour on top a NASA 747 took off from Kennedy Space Center for the last time in route for Los Angeles on Wednesday.

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Space Shuttle Endeavour is ferried by NASA's Shuttle Carrier Aircraft over Houston on Wednesday. NASA pilots

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View of Space Shuttle Endeavour from Tucson.

P.K. Weis/Southwest Photo Bank

Space Shuttle Endeavour on top a NASA 747 takes off from Kennedy Space Center for the last time in route for Los Angeles on Wednesday.

CNN

Space Shuttle Endeavour is seen atop NASA's Shuttle Carrier Aircraft, or SCA, at the Shuttle Landing Facility at NASA's Kennedy Space Center on Monday.

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Gabrielle Giffords and husband Mark Kelly watch Space Shuttle Endeavour travel over Tucson on Thursday.

P.K. Weis/Southwest Photo Bank

Gabrielle Giffords and husband Mark Kelly watch the Space Shuttle Endeavour travel over Tucson on Thursday.

P.K. Weis/Southwest Photo Bank

View of Space Shuttle Endeavour from Tucson on Wednesday.

Colin Prenger