It is arguably the world's most iconic plane, an instantly recognizable symbol of the US presidency.

But now Air Force One -- like many other American institutions once considered sacred -- is getting the Donald Trump treatment.

Technically Air Force One is the callsign for whichever US Air Force plane, no matter how small, is carrying the US president.

But most people identify it with the two heavily modified versions of the Boeing 747-200 jet liner that usually shuttle the US president around the world.

The two current models, called the VC-25A in military speak, both entered service in 1990 during the presidency of George H.W. Bush.

With its classic blue and white livery the current jumbo jet has become so famous that it even spawned a Hollywood thriller named after it, starring Harrison Ford.

Sometimes presidents use smaller planes based on Boeing 757s for shorter flights, dubbed "Baby Air Force One."

"Big Air Force One" boasts luxury features fit for a........

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