It is February, normally (with the exception of Chinese New Year) a low demand month for international travel in and out of Australia, but while there's a lag (most travellers unless going for a funeral or to be with relatives who are expected to pass away) do not book super close to day of travel, I wonder is the low A$ versus the US$ causing far fewer Australians to visit the "expensive" United States?
If this is occurring and hasn't been matched by a commensurate rise in the number of Americans visiting Oz, then all carriers on the routes (QFi, AA, DL, HA and UA) will be suffering low loadings, as will Air NZ given it offers connecting flights through Aukland.