The term 'FLIGHT EXTREME' can be broken down into two words, 'FLIGHT' and 'EXTREME'. FLIGHT is the act of moving through the air, usually in an aircraft. EXTREME refers to something that is far beyond the norm or ordinary. The crossword solution for this term is 'APOGEE', which is the highest point in an object's orbit around a celestial body. APOGEE is also used to describe the highest point of any object's trajectory, such as a rocket or an aircraft.