Pathfinding up and down?

This is just a general question, but is it possible to use pathfinding to make a part fly, or go up and down in the air??? So far I only know how to use pathfinding on ground.

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You will have to use custom pathfinding algorithms (not pathfinding service) for that. Here’s a video where they are using a custom pathfinding algorithm to create a Helicopter AI in Roblox: Roblox Helicopter AI is Finally Here and it is DEADLY - YouTube

But if your concern is just to see if your part can go up or down, you can just use Raycasting to check for possible obstacles.