I don't know how you would find these numbers but there are lots of pilot on cola's that will need to find a slot before the major's hire.

I don't think the majors will be hiring all that much, even with retirements. One or more airlines will go bankrupt during this period. I don't know which ones, but it is coming. Throw in more scope relief, most likely in bankruptcy, and those are major jobs that will disappear forever.