There are 11 Travel Air D-4000 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 1929 and 1930.
N477N
1930 Travel Air D-4000
Owls Head, ME
N671H
1929 Travel Air D-4000
Oklahoma City, OK
N8115
1929 Travel Air D-4000
Casper, WY
N1082
Travel Air D-4000
Thousand Oaks, CA
N406N
Travel Air D-4000
Columbia, MO
N420N
Travel Air D-4000
Thousand Oaks, CA
N466W
Travel Air D-4000
Thousand Oaks, CA
N478N
Travel Air D-4000
Thousand Oaks, CA
N5140X
Travel Air D-4000
Thousand Oaks, CA
N607H
Travel Air D-4000
Columbia, MO
N9027
Travel Air D-4000
Aguanga, CA