This document outlines 10 critical mistakes airplane owners make when selling an aircraft, according to XJet Executive Aircraft Brokers. The mistakes include: lying to potential buyers; not knowing details about the aircraft; showing desperation to sell; not engaging buyers in conversation; failing to make buyers feel they are getting a good deal; getting distracted by other problems; not listening enough; avoiding eye contact; poor follow up; and lacking enthusiasm when discussing the aircraft. The document stresses the importance of honesty, preparation, maintaining control of emotions, building rapport with buyers, and follow through.