Attrition forecasting on FAA workforce records.
The full account of this role, with a public source for each number, is being written. The DHS page shows the form it will take.
Try it: an attrition forecaster
How many people leave, and how many must be hired to hold headcount, as separation and retirement rates change. A made-up workforce; not FAA data and not the original model.
Agency names are where the work was done. They are not endorsements.