Originally Posted by
Pseudo Nim
... which is the opposite how Star works, so have to be careful. On the upside, as long as your ticket is sold by JAL (and all flights are JL), you can get some pretty good JL metal FOPs far beyond where JL reaches out to - something like SYD SIN NRT would work if your QF flight was with a JL number, which is pretty cool.
I don't think JAL has codeshare with QF. But yes, it gives a lot of extra options. Which is quite handy.