Hopefully Sam Altman's Helion will pan-out and we will have fusion to have better energy density so that I can have my water propelled plane. https://en.wikipedia.org/wiki/Nuclear_thermal_rocket#/media/...

Until then we have to stay tethered to the sea with something like Zapata's Flyride / Flyboard https://www.youtube.com/watch?v=PCAvIHGylKo

Edit : (We just have to put an electric jetski inside a fire-fighting plane, and have the Flyride pull the plane forward until it reach lift-off speed, (no expensive fuel needed :) )