I created this flying/floating animation pack for your characters with jetpacks or who can fly. The animations use HumanIK so you can use Generic or Humanoid animation type. You can also let me know what animations you'd like to see in future updates.
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Link: https://assetstore.unity.com/packages/3d/animations/flying-animation-pack-155965
Preview: https://www.youtube.com/watch?v=_yYaNRNPoVU