Takara/Hasbro got the molds for the VF-1 toy & intended to market it as Jetfire. but then, Harmony Gold fought them with the licensing (because they're greedy bastards). forcing Takara/Hasbro to rename & redesign the character into Skyfire, because they would get sued if they used the likeness of the VF-1.
The Jetfire/Skyfire thing is all Harmony Gold's fault.
wasn't part of the problem with the Jetfire character though was that harmony gold had the rights to the Valkyrie on loan from japan based on Macross. and when they started to go under they went about selling the idea. and the Japanese company showed up soon after going "excuse me!" threating to sue anything that tired to use the image?