Maybe federal government which hasn’t grown much (they contract everything). State and especially local government employment has been growing consistently for years, or growing very fast if you count education
ATC should probably be private like it is in Canada, where it functions very well, and also better lines up with how the federal gov operates
https://en.wikipedia.org/wiki/Nav_Canada
A lot of services are provided by contractors, including a few hundred control towers, the weather briefing system, the vast majority of flight and medical examiners, etc.
https://en.wikipedia.org/wiki/Government_employees_in_the_Un...
ATC should probably be private like it is in Canada, where it functions very well, and also better lines up with how the federal gov operates https://en.wikipedia.org/wiki/Nav_Canada