Do these "secret" C-20C's use ADS-B ? I've never seen one. They still seem to be in use as of May.
https://flic.kr/p/2jdpiwL
www.politico.com
https://flic.kr/p/2jdpiwL

The President’s Secret Air Force
Air Force One is just the public face of a fleet that keeps the president safe and secure.
