Whenever I operate across the pond the biggest problem we have is to get the work done in such a short flight time.The flights are usually full with maybe the early departures out of AKL with a few seats spare.
I can’t imagine the total daily capacity across the pond being the equivalent of 43 A-320’s .Even if you included the QF 767’s used as freighters the figure sounds imaginary.
In fact if the statement was that there were 630 spare seats per day I would doubt it let alone 6300.
I agree with rammel's conclusion