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I think the metal airplanes from the 60's will out last the newer composite airplanes that do have a mandatory service life. The important thing about metal airplanes is not how old it is but how many hours are on the airframe. Right now there are Cessna 172's with 20,000 hours. I think Skymasters average around 3,000-4,000hrs. So I think the Skymasters will be around for a long while.
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