The Learjet 45 is a small executive jet aircraft. Bombardier Aerospace is considered the manufacturer and developer. Serial release is dated 1998. Today there are over 260 aircraft of this model. The business liner is powered by TFE731-20BR engines. It differs in optimal takeoff weight, rate of climb and cruising speed. In 2004, commercial production of the Learjet 45 modification, the Learjet 45XR, began.