Aurora is refining the fuel-efficient D8 designed for NASA by MIT, hoping to fly a half-scale demonstrator in 2022.[4] The 180-seat, 3,000 nmi (5,600 km; 3,500 mi)-range airliner is designed to fly at 582 mph (937 km/h; 506 kn) within the capabilities of the Boeing 737 or Airbus A320 and could be in test service by 2027 at the earliest and 2035 at the latest.[5]