David Pekoske, the head of the TSA, tweeted that 95% of TSA employees are classified as essential workers and will work without pay in the event of a shutdown. Air traffic controllers are also considered essential employees and would be asked to work without pay. Federal employees would receive backpay after the shutdown ends.

https://www.forbes.com/sites/suzannerowankelleher/2024/12/20/tsa-holiday-travelers-longer-airport-lines-shutdown/

Second time I’ve had to do this in this thread.