A worker lines up the mount as a space shuttle replica is lifted into place atop the Shuttle Carrier Aircraft (SCA) Thursday morning, August 14, 2014, at NASA's Johnson Space Center in Houston. The old Boeing 747 formerly transported shuttles piggyback to Florida following flights. Visitors will be allowed to enter both vehicles when the permanent exhibit opens in 2015. (Photo by Kar B. Hlava/AP Photo/Conroe Courier)
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