There are 5 Curtiss Wright 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 1928 and 1929.
N8114
1929 Curtiss Wright TRAVEL AIR D-4000
Fayetteville, AR
N8175
1929 Curtiss Wright TRAVEL AIR D-4000
Thousand Oaks, CA
N8708
1929 Curtiss Wright TRAVEL AIR D-4000
Sleepy Hollow, CA
N6478
1928 Curtiss Wright TRAVEL AIR D-4000
Siloam Springs, AR
N455N
Curtiss Wright TRAVEL AIR D-4000
Jamestown, OH