Diddy Kong Pilot

Diddy Kong Pilot was the planned follow-up to Diddy Kong Racing, but instead focusing only on flying and nothing else. Due to Rare being acquired by Microsoft, Rare was already far at work into the game and instead of scrapping it altogether, the game was removed of all Donkey Kong references and was turned into Banjo-Pilot.
There are two known very different versions of the game, since it was remade from scratch mid-development.