TLDR - I think your huuuuuge November vacancy will hapen in August.

There's a thread on here with rumor mill of 4x classes at 50+ a class starting in the fall. If TK wants to continue to pair a NBCA upgrade with a new-hire sim parter for training you could infer that there will be an similar amount of NBCA upgrades made available. A vacancy of even 100 NBCA openings across the system seems rediculous, but they would need one in August if they want butts-in-seats for October training. They would need another similar vacancy a month later as well.