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well it all depends on its flight hours and how well it is maintained , a plane does have its limmits though if you take usaf kc135 tankers they are being constantly upgraded when they were early 707's they have new engines and a truck full of big upgrades i hope my awnser helps you a bit cheers =D

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Rosa Koelpin

Lvl 13
3y ago

What else can I help you with?