There are 4 Travel Air D-4-D 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.
N473N
1930 Travel Air D-4-D
Columbia, MO
N162V
1929 Travel Air D-4-D
Rcho Sta Marg, CA
N472N
1929 Travel Air D-4-D
Thousand Oaks, CA
N606K
1929 Travel Air D-4-D
Winnebago, IL