Other features of the Center include the Donald D. Engen Observation Tower, the Airbus IMAX Theater, and the Mary Baker Engen Restoration Hangar, where visitors can watch museum specialists at work ...

The donation, made in honor of Mr. Engen’s parents, will help build a new hangar for the museum’s Steven F. Udvar-Hazy Center where visitors can watch the restoration of historic airplanes. The ...