There's no reason GE Aviation, or anyone, would be excited about your "idea for a hoverboard", or give you credit in any way, because you yourself say that you can't contribute anything to the project intellectually, financially, or otherwise, and the idea itself is not a new one.

The idea was popularized in the 1989 movie Back to the Future Part II, and there are currently several people using their own skills to try to make commercially viable hoverboards (e.g. https://youtu.be/588du55BcAY?t=463 and https://youtu.be/588du55BcAY?t=31 and https://youtu.be/588du55BcAY?t=110)

So your only real option is either to learn the skills to create a prototype yourself, or to have some insightful, patented idea on a unique approach, or to have enough money to pay someone else to do all that for you.