After this subject first came up, I did a bit of research on the ATO web site, and came across ruling IT2015. This concerns those working equla time tours overseas, and, in effect, says that in that case, if you're working everyday, exceeding the 40 hour working week, and not accruing leave, then the time off does not constitute a break in foreign service.
Therefore, under the 91 day rule, no tax is payable. If anyone else has read this ruling, I'd like to hear how you interpret it.
I gather the ATO is gunning for those pilots working for asian airlines, but living in Australia, not those genuinely living overseas for half their lives.
TS