Launched in 1992 as a replacement for the Learjet 35, the medium range Learjet 45 represented the company's first clean sheet design since the original Learjet 23. Bombardier took full advantage of the opportunity to update and enhance its iconic jet, making the Learjet 45 the first business aircraft designed entirely on computer rather than paper. Bombardier also ensured the flat-floor cabin would be every bit as comfortable as the aircraft is capable, with an interior designed to offer the most usable passenger space possible for the volume, resulting in more legroom, greater seat width, and galley storage area than the Model 35. The aircraft is powered by two FADEC-controlled Honeywell TFE731-20AR engines developed specifically for the Learjet 45, each delivering 3,500 lbs. of thrust.