sky marshal

/S K AY1 M AA0 R SH AH0 L/
noun
  1. 1

    (law enforcement) An armed, undercover guard on a commercial-airline flight.

  2. 2

    A military rank in fiction for air force, space force, or armed forces, usually the topmost rank

Synonyms

Source: https://en.wiktionary.org/wiki/sky%20marshal