question..."how is the Jetstar position optimised because of a Sinagpore based aircraft?"
Thats an easy one,it's because the J*Asia aircraft are doing either very little and sitting on the ground or operating with only a handful of pax and so it is very much optimised by filling it up and operating it on a positive revenue sector for the first time since it was purchased ...
Not to mention freeing up a QF/AO 767 to use somewhere else....
The poor J* Asia cabin crew will probably have the first full pax loads of their careers as well