What?
Rather than having a static number of employees that only ever changes when new staff is hired or laid off, the workforce is split into “cohorts”. A cohort will likely correspond to a business period, which in AS is a week. Every week, a new cohort is created, and any new hires in that week will be part of this new cohort. After a certain amount of weeks (probably somewhere between 30 and 40 - think “working life”), more and more members of the oldest cohorts will leave the company due to age, meaning the company needs to re-hire staff to compensate.
There is also a natural continuous fluctuation which might be influenced by staff mood, job market conditions and other factors.
Re-hiring staff doesn’t come for free and requires resources, both in terms of personnel as well as direct costs.
Naturally, as cohorts age, they accumulate “experience”, which might be relevant to features like staff training, workforce performance, etc.
Cohorts also have their respective “memory”, meaning a cohort that experienced very bad or very good periods of their airline will “remember” this, which might be relevant to other features (staff mood, worker representation or similar). At the same time, such cohorts phasing out might have positive or negative effect on the workforce as a whole.
Why?
The key appeal of this feature by itself stems from the fact that it very naturally creates a handicap for older, larger airlines. As cohorts grow older, the need to re-hire staff increases relative to the existing workforce, increasing HR costs. It also creates inertia, as certain initiatives might require “convincing old cohorts”.
But besides this, this is first and foremost intended as a foundational feature for a whole array of other, more or less advanced HR-related features that can benefit in one way or another from a cohort-based model.
When?
This should be tackled fairly soon, at least in a basic version, as the current HR-part of the game is really old and probably the part of the game with the most bug reports on file (let’s not even talk about the awful user experience it provides). As such, this should likely be added with or shortly after Project “Glow-Up” (UI refresh).