BBC Doggie

secrets are so protected that most of this info has not been substantiated in any concrete way.

The next location is not fixed to the ground, but it's still one of the most protected places on Earth.

We're talking about Air Force One, the president of the United States by the jet.

Arguably the most secure mobile location, Air Force One describes any of the planes currently or previously in the service of the president,

many of which are Boeing models. While the full extent of Air Force One's security features is classified, a few of them are public knowledge.