The Military and Air Force One
Up until 1976, the Marine Corps and the Army shared responsibility for Presidential helicopter transportation. Marine One is Presidential Call Sign that is also generally recognized by the public. This indicates that the President is flying on a Marine Corps aircraft – Marine Two is used for the Vice President. When Army helicopters were/are used, the call sign Army One was/is for the President and Army Two for the Vice President.
Since 1976, the Marine Corps has sole responsibility for Presidential helicopter transportation and currently uses either a VH-3D Sea King or a VH-60N "WhiteHawk".
The Navy One and Navy Two call signs are used for Navy aircraft. There’s only been one use of the Navy One call sign – a Lockheed S-3B Viking (BuNo 159387) used to fly President George W. Bush in 2003 to USS Abraham Lincoln (CVN-72).
The Coast Guard One callsign has not yet been used, but Coast Guard Two was used once when Vice President Joe Biden used an HH-60 Jayhawk in 2009 to view the Atlanta Area that was flooded.
If it happens that the President is using a civil aircraft, the call sign for that craft would be designated Executive One, and if it is the Vice President, then it would be Executive Two. The only President actually in office to make use of regularly scheduled commercial airline flights since the establishment of Presidential Transportation was President Nixon in 1973 during the energy crisis. A notable exception to this was the use of a military helicopter in 2009, when it took aboard President George W Bush after his term in office had expired – the helicopter used the Executive One call sign.
On the topic of commercial air lines, if the president's family members are aboard, but not the president himself, the flight can (if it is determined by the White House staff or Secret Service to be necessary) use the call sign Executive One Foxtrot (“Foxtrot” indicating “family”). For the family of the Vice President, the call sign would be Executive Two Foxtrot.
https://www.thebalancecareers.com/presidential-aircraft-and-call-signs-3357025