That be the case for sure. I often have to be in the USA for Monday starts and regularly have trouble getting onto my first choice Sunday flight since my bookings are always last minute. Its quite a pain really.

It is also quite possible that QF11 that day is Skybed equipped, which may well be why the OP is wanting that particular flight. If that is the case, then there may well be a long waitlist of WP's who also know that same information but may also hold confirmed reservations for QF107.