Air Balloons are a type of aircraft that can be found in the real world. We see our first air balloon in the Adventure Time episode, "Five More Short Graybles." In the episode, they are used as battle machines.
In the second instance that we saw them in the episode, it was shown that they have cannons with missiles capable of destroying complexes the size of castles.
- The yellow air balloon has a similar design to Charlie (duck)’s shirt.