New Air Force One will carry a powerful legacy

It’s been done. That’s basically Air Force One in a nutshell.

Now the Pentagon has announced the next generation of this world-class icon will be a military version of the 747-8. For nearly 30 years, the current jumbo jet Air Force One has been a customized version of the 747-200B. The newer 747-8 is longer and more efficient than its older brother.

Why is a new one necessary? “It is time to upgrade,” Air Force Secretary Deborah Lee James said in a statement Wednesday. The difference between the civilian version and what the President will fly on: the commander in chief gets a plane that’s tricked out with top-of-the-line parts and backup systems. And a lot of technology that’s — well — classified.

Related: What’s new about the 747-8?

Let’s remind ourselves why the world is so fascinated with this flying technological marvel.

For more than half a century, passengers aboard the U.S. presidential aircraft have been witness to American history.

Capable of in-flight refueling from airborne tankers, manufacturers say the aircraft has “virtually unlimited range” — its passengers sustained by galleys capable of storing up to 2,000 meals at a time.

The entire aircraft is shielded against the effects of electromagnetic pulse — a wave of energy generated by the detonation of a nuclear device that can disable unprotected electronics.

It features private accommodation, office space and a workout room for the President, first lady and family; as well as accommodation and offices for support staff and security personnel.

Also on board is a stateroom and conference rooms that can, should it ever be necessary, be converted into a fully functional airborne medical center.

CNN’s Joe Havely contributed to this report.

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