An eligable QF flight is a flight where you are booked on a Qantas or jetstar flight number and is eligable to earn points
Any SCs you earn up to 31 August will be lost when membership year is reset
I would suggest that if you want status that you join the AA AAdvantage FF scheme sign up for the AA Platinum Challenge ( $250 sign up fee ) since a r/t BNE-ABZ on BA flight numbers will be enough to earn Platinum status ( OW Sapphire c.f. QF Gold status ) until 28 Feb 2015.