Hi Garry,
Not all aircraft are fitted with ACARS, and some may be fitted with ACARS but with it operating on other frequencies (from Europe etc). With many aircraft transmitting ACARS data, some transmissions can be lost or corrupted, or they can simple be out of range, or their transmissions affected by weather or atmosphereic conditions.
The flights showing for ACARS on 16Right.com are from my database, which can be somewhat historical and need updating. I will have a look at the QF flights you mentioned.
There is also an ADSB section to 16Right.com which has a better coverage that ACARS, but not necessarlily all the flight received by ACARS.
Hope this helps.
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