What parking of jets and what plussing up?

I don't think the 747 announcement will effect short term forcasts for ATL narrowbody FO reserves at all.

The 737 is growing of course, which helps, but its several pay steps above the bottom and ATL is a much more senior base than most on average. While its possible to get a line quickly in it, it will almost always take a lot longer than more junior equipment. Besides, the 717 is growing at a faster rate anyway.