Originally Posted by
gearlever
I think it stays for Adv, whatever that means.....
Probably correct - the Advanced had revised flaps and slats, as well as the -17 engines, for improved short-field performance (lower takeoff and landing speeds).
C refers to it being a cargo/pax
Convertible, but not a QC (quick change) or Combi.
Here's a different airframe with the same sub-type designation, which also has the "gravel runway kit" (signature "ski" gravel deflector around the nose gear, and other mods/reinforcing):
https://www.planespotters.net/photo/...eing-737-275ca