California Code, Public Utilities Code - PUC § 5383

The commission shall create the following classifications or types of certificates for charter-party carriers of passengers:

Class A:  from any point or points within the state to other points in or out of this state, including, but not limited to, the conduction of round-trip sightseeing tour service.

Class B:  from any point within the territory of origin specified in the certificate to any points in the state, or territory of origin.

Class C:  services provided incidental to commercial balloon operations, commercial river rafting, or skiing where no additional compensation is provided for the transportation.