There are 4 Learjet 55 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 1981 and 1983.
N558RA
1983 Learjet INC 55
Greeley, CO
N54NW
1982 Learjet INC 55
El Paso, TX
N976DG
1981 Learjet INC 55
Wilmington, DE
N550TC
Learjet INC 55
Vero Beach, FL