A porto-sled.
A porto-sled was a type of flying vehicle used on the Traveler's homeworld.
History[]
In 2265, when the Traveler returned home and brought USS Enterprise officers James T. Kirk, Spock and Leonard McCoy with him, they saw a man being pursued by a robot flying a porto-sled. After shooting the man, the robot attacked the new arrivals, but it and the porto-sled were destroyed by the Traveler. (TOS comic: "Dark Traveler")