Since there is no thread on Tai Pan Tours or AZ Bus Tours, I guess I'll start one up!
According to my sources, since all 10 Setras have been retired and sold off, AZ Bus Tours can't do outbound Charters for Tai Pan Tours due to fleet shortage with their Casino Rama Line Runs. Tai Pan has contracted to Attridge Transportation to specifically do the outbound Charters. Before Attridge, Tai Pan would use Autocar Preference (which in my opinion Preference has better buses compared to Attridge) to do outbound Charters.
In regards to Attridge, I heard that they will decal their buses with Tai Pan Tours just like the AZ Bus Coaches. However, its unclear if Attridge plans on getting new Coaches or use their current fleet. That's all I know for now.