I think the title of this thread is misleading. JQ are using JQ jets for FMG. JQ won a 5 year contract.
I believe domestic JQ crew will crew it. International crew can't operate domestically as far as I'm aware.
Makes sense when the competition are running A320s (albeit ancient ones) too.
It'll be an interesting flight deck on the F100s when JQ crew are jumpseating on familiarity flights. I hope professionalism rules supreme.