There are 26 Travel Air 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 1926 and 1929.
N1339
1929 Travel Air 4000
Hood River, OR
N31439
1929 Travel Air 4000
Chatham, NY
N469N
1929 Travel Air 4000
Bridgewater, VA
N501V
1929 Travel Air 4000
Sanger, TX
N8719
1929 Travel Air 4000
Wilmington, DE
N8870
1929 Travel Air 4000
Wainscott, NY
N9021
1929 Travel Air 4000
Glen Rock, PA
N9031
1929 Travel Air 4000
Chico, CA
N90539
1929 Travel Air 4000
Columbia, MO
N9820
1929 Travel Air 4000
Dunedin, FL
N9908
1929 Travel Air 4000
Shullsburg, WI
N3979
1928 Travel Air 4000
Port Orange, FL
N4421
1928 Travel Air 4000
Bonita, CA
N4834
1928 Travel Air 4000
Dallas, OR
N5427
1928 Travel Air 4000
Casper, WY
N5433
1928 Travel Air 4000
Temecula, CA
N6479
1928 Travel Air 4000
Cross, SC
N9049
1928 Travel Air 4000
Hood River, OR
N3945
1926 Travel Air 4000
Prunedale, CA
N158V
Travel Air 4000
Anacortes, WA
N4251N
Travel Air 4000
Thousand Oaks, CA
N427W
Travel Air 4000
Valleyford, WA
N4369P
Travel Air 4000
Thousand Oaks, CA
N4419
Travel Air 4000
Ann Arbor, MI
N510E
Travel Air 4000
Thousand Oaks, CA
N9831
Travel Air 4000
Clackamas, OR