looks like the rules have changed re min crew 747.
currently 12 crew full a/c.
reduced pax(none upper deck) is 11.
i don't know how long these rules have been about.
be careful booking jetstar over the xmas/new year period. they are already canceling flights on an ad hoc basis re crew shortages. the last week of each roster is when this is happening as crew reach max hours. be aware with xmas in this roster things will definitely not be any better this month!