- This article is about the airship. For the song, see "The Spirit of Adventure".
Muntz has traveled the world in this airship, and has used it to collect various things he finds along the way. Within the giant ship are several chambers, including a dining room, and a hall of animal skeletons, which were destroyed during the fight between Muntz and Carl Fredricksen. The bones of a "snipe" (the species Kevin is) can also be seen in the airship, including all the helmets of fallen adventurers he has knocked off and stored inside. She also has a hangar to carry small biplanes, three of which the dogs use to try to attack Russell, though he distracts them and the three planes collide.
- The Spirit is described during the news reel shown at the start of Up as "longer than 22 prohibition paddy wagons." The average police wagon of the prohibition era was approximately 25 feet long, making the spirits length greater than 550 feet with a possible hull diameter (width) of about 100 feet.
- The Spirit's design is based largely on the German airship LZ 127 Graf Zeppelin, but with 8 engines on her hull that can be pivoted forwards and backwards, similar to the USS Macon's vectored thrust engines. The airship's aircraft carrying hull is based on those of the ZRS airships used by the US Navy, the USS Akron and USS Macon, and the large hooks on the upper wings of the biplanes it launched suggest similar hangar operation to these two ships.
- The airship also bears similarities with one of Goodyear-Zeppelin's later concept designs, the ZRCV (which was never built), which was to have an elongated gondola as with the Spirit.