According to the NYT article, when Biden flies today, he won't be on the actual Air Force One (though it will still be called that because he's on it), but a smaller 757.
They're not even going to let him experience the real thing. Too funny.
https://www.nytimes.com/2021/02/05/us/politics/biden-air-force-one.html
After Years in Government, Biden Has a New Perk: Air Force One. - The New York Times
On Friday, he flies home for the first time as president. But it may not be on the plane that has delighted his predecessors.
https://www.nytimes.com/2021/02/05/us/politics/biden-air-force-one.html