The Learjet 31 is an eight passenger with two crew members, twin engine business jet. The cruise speed is 448 kts (515 mph, 829 km/h), the stall speed is 84 kts (97 mph, 156 km/h), and the maximum speed is Mach 0.81 (464 kts, 534 mph, 860 km/h). The empty weight of the aircraft is 9,857 lbs (4,471 kg) and the maximum takeoff weight is 15,500 lbs (7,031 kg). The Learjet 31A features an increase in cruising speed, changes to the instrument layouts, and a digital avionics system from Honeywell. The Learjet 31AER is the extended range model and features standard thrust reversers, divided air conditioning system and a digital control (FADEC).