There are 4 Dornier BU 133 aircraft on the U.S. registry that TailWiki has a page for. Every one is built from the public FAA record — year, serial, engine, home base, and registration history — and owners and pilots add photos, trips, and stories on top. The ones listed here were built between 1938 and 1997.
N100BU
1997 Dornier BU 133
Landenberg, PA
N133JH
1940 Dornier BU 133
Coronado, CA
N85BU
1940 Dornier BU 133
Graford, TX
N33XX
1938 Dornier BU 133
Estes Park, CO