Hovering Motion

I’m having a hard time finding examples or tutorials on making an item look like it’s hovering due to the use of the term “hover” when it comes to menus. I’m not trying to do anything menu-related, but what I’m looking for is an example of something like a helicopter or a person with a jetpack on hovering around in the air. I’ve tried using some motion guides, but it didn’t look that realistic. Any suggestions?