Asset on Epic (Unreal Engine) Marketplace, "Sci-Fi Drive 2 Fly Customizable Modular Vehicles"
Link: https://tinyurl.com/bhkwhws3
Main features:
* Several kinds of vehicles that can transform from driving to flying, and back.
* Modular physics-based vehicles templates that uses only static meshes (no skeletal meshes, no plugins).
Video - "Classic Flying Car", so to speak.
Video - transforming Rover with detachable wheels module.
Video - Self-unloading trucks. No, these do not fly.