Hi flightasia, hope all is well in Aisa.
Although I don't agree with foreign based crew on principle, what difference is there with the Jetstar situation with Australian registered aircraft compared with what Qantas mainline have been doing for 20 years now, first with NRT base, then BKK and AKL based crew and more recently LHR based crew.
They have been operating on Australian registered aircraft with Aussie pilots and sometimes the only Australian based cabin crew are the CSM and CSS?
On the flights with London based crew, there are often no Australian based crew.