The term 'PART OF AN AIRCRAFT' can be summarized by the crossword solution 'NOSE', which is a four-letter word. The NOSE of an aircraft is the front part of the fuselage, which is the main body of the aircraft. It is usually the most visible part of the aircraft and is often used to refer to the entire aircraft. The NOSE of an aircraft is also used to house the cockpit, where the pilot and other crew members sit.