X-Plane 9.70 – Boeing 307 Stratoliner 1.1. The Boeing Model 307 Stratoliner was the first commercial transport aircraft to enter service with a pressurized cabin. This feature allowed the aircraft to cruise at an altitude of 20,000 feet (6000 m), well above many weather disturbances. The Model 307 had capacity for a crew of five and 33 passengers. Thanks to Jacques Brault, who made the original aircraft (published with permission), and to dataroots for his wonderful sounds. By Thibaud Duhamel.