McBolty,
With JQ now able to operate the 320's with 4 crew as opposed to 5 there will be extra crew surplus so to speak so I guess that could fill the void.
1 crew member per 50 pax on the 320 is 4 crew.
1 crew member per 50 pax on the 321 is 5 crew.
But I could be wrong. I am just a pretty air hostess after all,