There are 3 Douglas AD-4 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.
N23827
1949 Douglas AD-4
Virginia Beach, VA
N409Z
Douglas AD-4
Houston, TX
N4277P
Douglas AD-4
Beaverton, OR