I think a few of you are on the wrong track with the Oz property thing, I own oz property and lodge an Oz tax return every year and pay no Oz tax, nor am I required to.
The Jet* pilots going to SIN will be on LWOP from their Oz company working for another company that happens to be owned by the same mob they are on LWOP from, so good luck convincing the ATO you have no intention of returning any time soon
A private ruling is the only sure way, but be prepared for disappointment
Otherwise, listen to 404
The only one here with actual credentials in this area