The Learjet 70 and 75, the marketing names for the Learjet 40 and 45 upgraded with Garmin G5000 avionics, improved winglets and more-powerful Honeywell TFE731-40BR turbofans, among other modifications, are far more capable than the original models that entered service 20 years ago. They have about 2% less drag due to aero improvements and 200 lb. less weight in the nose because of the avionics upgrade, resulting in less trim drag. That translates into a 4% range increase as well as higher ...

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