Delivered to JCB as G-BBCL and reregistered as G-BJCB in 1973. Back to G-BBCL and sold as 9K-ACZ in 1977. Back to G-BBCL then to the Irish Air Corps as 239 in 1979. Back to G-BBCL in 1980. Converted to an F600B then reregistered as D-CCEX and back to G-BBCL in 1983. Reregistered as series F600A N600AV in 1985, N917K in 1987, N777SA in 1994, N777TK in 1998, N700XJ in 2000 and N957MB in 2003. Used as a ground trainer at Hawthorne, CA by 2006.

This is the first use of this registration, used on c/n 256015 from August 1973 until December 1977. The same registration was later worn by c/n 256065 from February 1977 until July 1981. Very unusual for the United Kingdom civil aircraft register. Name is visible in very small letters next to the door. [Nikkormat FTn + Nikkor 50/2]