There are 6 Billings Flying Service CH-47D 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 1990 and 1993.
N401AJ
1993 Billings Flying Service INC CH-47D
Billings, MT
N227AJ
1992 Billings Flying Service INC CH-47D
Billings, MT
N404AJ
1992 Billings Flying Service INC CH-47D
Billings, MT
N405AJ
1992 Billings Flying Service INC CH-47D
Billings, MT
N259PJ
1990 Billings Flying Service INC CH-47D
Red Bluff, CA
N562AJ
1990 Billings Flying Service INC CH-47D
Billings, MT