I guess I wasn't as clear as I could be. Under 135, the aircraft can and is flown single pilot (it is certified that way). It is in the opspecs due to the requirement of the 91k language, not 135, that states ALL turbine aircraft operated under 91k rules must have 2 qualified pilots, the captain must hold an ATP, and of course a commercial for the second in command. If all Avantair did was charter, the seniority list would probably be cut in half.