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Skyfire or Jetfire, whichever name you go with it's still the same robot.
Though recently (e.g. TF: Animated, RotF) he's been called Jetfire his G1 series name was Skyfire, though why this was the case I'm not sure.
I've always felt slightly sorry for Skyfire/Jetfire because of his past, he was best friends with Starscream and he ended up betraying poor Skyfire. Thus he's always been a bit two sided.