Hot air balloon
A hot air balloon was an aircraft consisting of a fabric enclosure, the balloon, filled with air that is a higher temperature than the air outside the enclosure. The lower density of the hot air inside provides lift for the craft. 

A hot air balloon was used by Kelemane in an attempt to send a letter to the object in the sky known as the "Ground Shaker". ()

An image of several balloons was seen by Harry Kim, Neelix, and Kes while monitoring Earth communication after being transported to the year 1996. ()

External link 
 
de:Heißluftballon
Vehicles
Earth vehicles