CNET:

Air Force One is easily the most well-known plane in the world. But the term “Air Force One” doesn’t apply to one specific plane: It’s the official military call sign for any US Air Force plane carrying the president.

Since 1990, two nearly identical (and heavily modified) Boeing 747-200B airliners have transported US presidents and served as airborne command centers during times of crisis. Here’s everything you need to know about the president’s personal airplane — and its future.

I’ve always been fascinated by Air Force One, not only as a symbol of America but for its incredible (and mostly secret) technology and amenities.