The term FAST FLIGHT can be broken down into two crossword solutions: LAM (3 letters) and RUN (3 letters). LAM is an acronym for Low Altitude Missile, which is a type of missile that is designed to fly at low altitudes. RUN is an acronym for Rapid Unmanned Navigation, which is a type of navigation system used by unmanned aerial vehicles. Together, these two solutions form the term FAST FLIGHT, which stands for Low Altitude Missile Rapid Unmanned Navigation.