"Via Airlines" is a DBA of Charter Air Transport. "Via Air" is the part 380 organization selling the seats. When I said "Via", I did not differentiate between the two. My mistake.
Code shares are not mandatory for 121 ops, granted most take advantage of the marketing opportunity.
Not sure where you are getting the no-phone-call-for-ticket-change policy.
I stand corrected and agree the open-ended ticket restriction is a material difference between 380 and 121 ops. So, from a passenger perspective, it appears that is the the only major practical difference between Public Charters and Scheduled Airline Service.