Amazon isn’t just thinking about delivery with its drones.

The new patent made public this week reveals an idea for a drone-powered towing system designed for skiers, surfers, skaters, and more.

“While there are various known uses for unmanned aerial vehicles, certain techniques for controlling the unmanned aerial vehicles are relatively limiting with respect to other uses,” according to the patent filing, originally filed in June 2016. “For example, current hand-operated remote controls for automated aerial vehicles are not conducive to users being able to operate the remote controls while simultaneously utilizing their hands for other purposes.”