how many initial training events does it trigger in the waterfall?

My count 8-10.

When we add the 190s 10-12.

500 retirements times an average of 6 initial training events per retirement (not every retiree is a 777A) equals 3000 initial schools in 12 months.

800 retirements X 6 = 4800 initials in 12 months.

Got milk? (Sims) (instructors)

Food for thought