Why would this plane be considered a "civil" aircraft?

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"Executive One is the call sign designated[1] for any United States civil aircraft when the president of the United States is on board. "

https://en.wikipedia.org/wiki/Executive_One

"Civil aviation is one of two major categories of flying, representing all non-military and non-state aviation, both private and commercial. "

https://en.wikipedia.org/wiki/Civil_aviation