Airline codes-J - Wikipedia, the free encyclopedia
I would have thought if the flight was a "Jetconnect" callsign & operated as the airline designator code QNZ. Then it would be a jetconnect flight codesharing for Qantas (QF).
The absence of the QNZ designator & callsign, combined with the conditions of carriage on the QF website stating that QF, QFLink & Jetconnect services are Qantas services pretty much sums it up.