Sorry Peter, just copying a nickname one of the crew gave it.
Air Force II was the name affectionately use by one of the crew members, was just trying to help someone out with some info.
In fact you need to be corrected, and aircraft is not named by any of its call sign’s, they are simply call signs, but as a back up, to which is a roll it is currently sitting in, it is an apt description. And in fact if it was called out for the reason it is sitting there for, who knows what call sign it would go under, probably “Air force I” because it was on a dedicated presidential role.
PS if you need further tutoring PM me and we'll have a glass of milk together, I am sure you are more polite when your sitting next to me.