Highly desirable non-pressurized 601B, economical like the 600 but with longer wings, greater payload (2125#), and faster. The engines are io540's but are turbo normalized with 2 small turbos on each engine. The result is power at altitude boasting 302 mph at 25,000'. The 601B is rare with only 44 produced. They are less costly to maintain like the 600's but fast like the pressurized versions. Seating for 7 the Aerostar is a dream to fly. Unlike most competitors it meets or exceeds book in performance, and is easy and predictable to fly. If you ever fly an Aerostar you'll never want anything else.