There are nearly 6,900 turbojet and turbofan business aircraft that are 30 or more years old — more than double the figure of just five years ago — and this number grows every year, according to JetNet LLC, an aviation market intelligence firm based in Utica, N.Y. And a sizable chunk of these geriatric jets, such as Cessna Citation 500s, Dassault Falcon 10/20 and Learjet 35/36 models, are pushing 40. At some point, old aircraft no longer will be viable. “When should you ...


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