The Starship Jefferson is the fastest vehicle ever conceived by humanity, able to, seemingly, cover a billion lightyears in a matter of weeks. Unlike the Legion's space.thingees, the Jefferson doesn't use Thingy Technology.
It was first seen during Beige Countdown, when the LNH used it to pursue the Legion of Net.Villains on the way to the Ultimate Black Hole. Surviving a chaotic space battle, it ended up in another universe, with the entire crew transmatted away except for Deja Dude...
It is, of course, named after the band Jefferson Starship.