There are 3 Aero Union P3A 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 1964 and 2010.
N900AU
2010 Aero Union Corp P3A
North Hollywood, CA
N925AU
1964 Aero Union Corp P3A
Starke, FL
N923AU
Aero Union Corp P3A
North Hollywood, CA