The Bombardier Learjet 60 is a mid-size cabin, medium-range business jet aircraft manufactured by Bombardier Aerospace, powered by two Pratt & Whitney PW305A engines, it has a range (with 4 passengers and 2 crew) of 2,405 nautical miles (4,454 km) with NBAA 100 nmi (190 km) reserves, ISA. The Learjet 60 is an improved version of the Learjet 55, with a longer fuselage and more powerful turbofan engines. The modifications that converted the Learjet Model 55 into a Model 60 resulted from an aerodynamics improvement program and a need to increase the capacity of the Learjet product line.