When the president is on a civil aircraft, what phrase is used?

The phrase used when the president is on a civil aircraft is "Executive One." This designation is part of the broader system of identifying the president's aircraft, regardless of the specific model or airline. When the president is aboard any civil aircraft that is not specifically the official presidential aircraft, it is referred to as "Executive One" to signify that it is being used for presidential travel.

The term "Air Force One" specifically applies only when the president is on an aircraft operated by the United States Air Force, typically the specially outfitted Boeing 747 used for presidential transport. "Commander in Chief One" and "Presidential Flight One" are not recognized designations in official usage for the president's travel on civil aircraft. Therefore, "Executive One" accurately reflects the appropriate terminology for that scenario.