Arguably the world’s first production model business jet – the aircraft type that has revolutionized private aviation – this aircraft was the sixth Model 23 to come off the Learjet assembly line in Wichita. It was the first Model 23 put into actual business jet use because the first five were prototypes or used as certification tools. Learjets were the pioneer private jet aircraft. They have been followed by a proliferation of designs and models. The aircraft has impressive performance: 518 mph cruising speed, 552 mph maximum speed, 6,900-feet-per-minute rate of climb, 1,830-mile range, 45,000-foot ceiling. According to the Smithsonian Institution, the Model 23 can outclimb an F-100 Super Sabre to 10,000 feet. A similar Learjet Model 23 is currently on display at the Udvar Hazy Wing of the Smithsonian.