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In this handout provided by NASA, space shuttle (Credit: Getty Images)

In this handout provided by NASA, space shuttle Discovery is tethered to the back of NASA 905 Shuttle Carrier Aircraft (SCA), a modified Boeing 747 jumbo jet, as it as it does a fly over Washington, D.C. (April 17, 2012)

Space Shuttle Discovery

Space Shuttle Discovery flew on top of a Boeing 747 jet from Cape Canaveral, Fla. to Washington, where it will become an exhibit at the Smithsonian National Air and Space Museum in Washington.

In this handout provided by NASA, space shuttle
(Credit: Getty Images)

In this handout provided by NASA, space shuttle Discovery is tethered to the back of NASA 905 Shuttle Carrier Aircraft (SCA), a modified Boeing 747 jumbo jet, as it as it does a fly over Washington, D.C. (April 17, 2012)

Space Shuttle Discovery atop a 747 carrier jet
(Credit: AP)

Space Shuttle Discovery atop a 747 carrier jet taxis down the runway before leaving the Kennedy Space Center in Cape Canaveral, Fla. Discovery is being transported to the Smithsonian National Air and Space Museum in Washington. (April 17, 2012)

The Space Shuttle Discovery takes it last ride
(Credit: Getty Images)

The Space Shuttle Discovery takes it last ride on the back of a NASA's Boeing 747 Shuttle Carrier Aircraft (SCA), seen here on a pass over Washington, Dulles airport. Shortly after the CSA flew over the Washington, D.C., area, the shuttle was on it's way to it's new permanent display at the Smithsonian National Air and Space Museum's Steven F. Udvar-Hazy Center in Chantilly, Va. (April 17, 2012)

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The Space Shuttle Discovery, teathered to the back
(Credit: Getty Images)

The Space Shuttle Discovery, teathered to the back of a modified 747 jumbo jet, passes over the Smithsonian National Air and Space Museum Steven F. Udvar-Hazy Center in Chantilly, Va. Hundreds of people arrived early in the morning to watch the arrival of the shuttle from the parking lot of the center. The oldest and most traveled vehicle in NASA's space shuttle program, Discovery will be placed on permanent display at the museum. (April 17, 2012)

From left, Max Sigrest, 6; Rachel Teufert, 16;
(Credit: Getty Images)

From left, Max Sigrest, 6; Rachel Teufert, 16; Jason Kuhns; Samuel Sigrest, 4; and Piper Sigrest, 15 of Woodbridge, Va., watch as the Space Shuttle Discovery -- bolted to the back of a modified 747 jumbo jet -- passes over the Smithsonian National Air and Space Museum Steven F. Udvar-Hazy Center in Chantilly, Va. Hundreds of people arrived early in the morning to watch the arrival of the shuttle from the parking lot of the center. The oldest and most traveled vehicle in NASA's space shuttle program, Discovery will be placed on permanent display at the museum. (April 17, 2012)

The Space Shuttle Discovery rides atop a Boeing
(Credit: Getty Images)

The Space Shuttle Discovery rides atop a Boeing 747 as it flies past Washington. The retired shuttle was traveling to the Smithsonian's Air and Space Museum's Udvar-Hazy Center in Chantilly, Va., where is will go on display. This photograph was taken at the Top of the Town in Arlington, Va. (April 17, 2012)

People wait for the arrival of the Space
(Credit: Getty Images)

People wait for the arrival of the Space Shuttle Discovery in the parking lot of the Smithsonian National Air and Space Museum Steven F. Udvar-Hazy Center in Chantilly, Va. Hundreds of people arrived early in the morning to watch the arrival of the shuttle from the parking lot of the center. The oldest and most traveled vehicle in NASA's space shuttle program, Discovery will be placed on permanent display at the museum. (April 17, 2012)

People on a rooftop watch as the Space
(Credit: Getty Images)

People on a rooftop watch as the Space Shuttle Discovery rides atop a Boeing 747 as it flies past Washington. The retired shuttle was traveling to the Smithsonian's Air and Space Museum's Udvar-Hazy Center in Chantilly, Va., where is will go on display. This photograph was taken at the Top of the Town in Arlington, Va. (April 17, 2012)

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Space Shuttle Discovery mounted atop a 747 shuttle
(Credit: Getty Images)

Space Shuttle Discovery mounted atop a 747 shuttle carrier aircraft, flies by the Washington Monument during a flyover of the nation's capital on its final trip to its retirement place in Washington, DC. The longest-serving orbiter in the space shuttle fleet was flown from Kennedy Space Center in Florida to the Washington, D.C., area to be transferred to the Smithsonian National Air and Space Museum and will be placed on display in the museum's Steven F. Udvar-Hazy Center. (April 17, 2012)

The Space Shuttle Discovery rides atop a Boeing
(Credit: Getty Images)

The Space Shuttle Discovery rides atop a Boeing 747 as it flies past Washington. The retired shuttle was traveling to the Smithsonian's Air and Space Museum's Udvar-Hazy Center in Chantilly, Va., where is will go on display. This photograph was taken at the Top of the Town in Arlington, Va. (April 17, 2012)

The final crew of Discovery stands near the
(Credit: Getty Images)

The final crew of Discovery stands near the space shuttle at the Kennedy Space Center in Florida. (April 16, 2012)

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