According to what I've been told, SATA's C seat is a slightly enhanced version of Domestic First in the US. But I can't help you with further details...

Miles earned in SATA's regular flights (not charter ones, operated under the name "Azores express" rather than "SATA International", mostly to Canada) will soon be credited in TAP Portugal's Victoria program: http://www.flytap.com/Portugal/en/Co...sReleases/7178.

Anyway, I can assure you the Azores are undoubtfully worth a visit!!!