Originally Posted by NM
Its possible that the same VS aircraft could not be used for both LHR-HKG-SYD and SYD-SFO if there is a requirement that the Australian operator of the flight (Virgin Blue operating as Pacific Blue or Planet Blue etc) may have to use a VH-registered aircraft. QF re-registered VH-NLH when leasing it from BA.
It could always carry two registrations. (Remember the BA Concorde which also carried an 'N' regitration for when it operated the domestic US flights under the Braniff code?)
Dave