There are 3 Express Acft SERIES 90 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 2000 and 2004.
N235MJ
2004 Shell R D EXPRESS S-90
Lufkin, TX
N264NS
2003 Kelley Shawn J EXPRESS SERIES 90
Cottage Grove, OR
N174JK
2000 Butler James A SERIES 90
Goodland, IN