There are 6 Sukhoi SU-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 1995 and 2000.
N131GT
2000 Sukhoi SU-31
Carson City, NV
N69SU
1996 Sukhoi SU-31
New Bern, NC
N131BT
1995 Sukhoi SU-31
Wilmington, DE
N310BW
1995 Sukhoi SU-31
New Bern, NC
N31KX
1995 Sukhoi SU-31
Fremont, NH
N31CY
Sukhoi SU-31
Sandpoint, ID