There are 10 Lockheed 18-56 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 1942 and 1952.
N250D
1952 Lockheed 18-56
Mount Pleasant, TX
N177L
1949 Lockheed 18-56
Houston, TX
N96334
1946 Lockheed 18-56
Manakin Sabot, VA
N1940S
1943 Lockheed 18-56
Mount Pleasant, TX
N21G
1943 Lockheed 18-56
Bellingham, WA
N250TS
1942 Lockheed 18-56
Lancaster, CA
N31G
1942 Lockheed 18-56
Houston, TX
N41CW
Lockheed 18-56
Ione, CA
N631LS
Lockheed 18-56
Marion, MT
N781G
Lockheed 18-56
Tupelo, MS