There are 5 Howard Aircraft DGA-11 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 1937 and 1939.
N18211
1939 Howard Aircraft DGA-11
Wilmington, DE
N18207
1938 Howard Aircraft DGA-11
Mount Pleasant, TX
N57E
1938 Howard Aircraft DGA-11
Santa Paula, CA
N14887
1937 Howard Aircraft DGA-11
Ennis, MT
N17Y
Howard Aircraft DGA-11
Missoula, MT