These features make Air Force One an incomparable flying fortress (businessinsider.com)
"Embellished with the American flag, the presidential seal, and the words United States of America, the world's most famous plane is as tall as a six-story building and gives an undeniable authoritative presence wherever it flies."
VC-25 - Air Force One (af.mil)
"The presidential air transport fleet consists of two specially configured Boeing 747-200B's -- tail numbers 28000 and 29000 -- with the Air Force designation VC-25."
Do Obama and Biden Always Fly in Separate Planes? (slate.com)
"The plane crash near Katyn, Russia, that killed dozens of Poland's top political leaders on Saturday has been compared to "Barack and Michelle Obama, Joe Biden, Hillary Clinton, Olympia Snowe, Christopher Dodd, Rahm Emanuel, [and] the Joint Chiefs of Staff" crashing "a half mile from Pearl Harbor.""
Air Force One (whitehouse.gov)
"Although 'Air Force One' can describe any Air Force aircraft carrying the President, it is now standard practice to use the term to refer to specific planes equipped to transport the Commander-in-Chief."