With 60% being the magic number...
900 new hires per year + scheduled pilot retirements though 2021 = 2014 hires reaching 60% in the first half of 2021.
I think 2015-2016 hires will reach 60% in the first half of 2022 as Age 65 retirements accelerate in 2021 onward.
This is also not taking into account any early-outs.
There's my napkin math. The question is... being a commuter Zap, would you take the first available upgrade?