There are 9 Fairchild KR-31 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 1927 and 1930.
N10290
1930 Fairchild KR-31
Oklahoma City, OK
N327H
1929 Fairchild KR-31
Hood River, OR
N5796
1928 Fairchild KR-31
Woodland, CA
N7247
1928 Fairchild KR-31
Baldwin Park, CA
N7563
1928 Fairchild KR-31
Kingsbury, TX
N7744
1928 Fairchild KR-31
Sonoma, CA
N3615
1927 Fairchild KR-31
Ellsinore, MO
N10015
Fairchild KR-31
Gibsonville, NC
N204H
Fairchild KR-31
Massey, MD