This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
AC This photograph shows McDonnell Douglas being installed in the National FullScale Tunnel Aerodynamics Complexs by foot test section. Note how two movable floor sections allow the gantry crane to move completely inside through the large doors. AC This photograph shows McDonnell Douglas being installed in the National FullScale