Newslink: Pluto's Biggest Moon Could Give an Orbiter an (Almost) Free Ride
A spacecraft orbiting the dwarf planet could use Pluto's moon Charon to make important orbital changes.
https://www.space.com/42270-pluto-moon-charon-orbiter-mission-concept.html
Did they ever get a craft to orbit the 8th or 9th planet? Very cool stuff here. Here is an upvote.