IIRC there is no dedicated „Air Force One“. It’s just whatever plane the POTUS happens to be on. Of course usually that boils down to very specific few aircrafts, but if he boards the bribe-jet, this would be „Air Force One“ at that point.
Edit: I just checked. https://en.wikipedia.org/wiki/Air_Force_One
Yes, completely on device. I happen to personally know one of the maintainers and got to discuss some of the code with her. Also completely open source, so if you don’t trust the packaged apps, you could even build it yourself from source
https://gitlab.com/bloodyhealth/drip