The term 'aircraft door' refers to the entrance and exit points of an aircraft. The crossword solutions for this term are MIG (3 letters), STOL (4 letters), AERO (4 letters), and PLANES (6 letters). MIG stands for 'Mikoyan-Gurevich', which is a series of Soviet military fighter aircraft. STOL stands for 'Short Takeoff and Landing', which is a type of aircraft that can take off and land in a short distance. AERO stands for 'AERONAUTICS', which is the science of designing and flying aircraft. Finally, PLANES is a general term for any type of aircraft.