"Arale Flies the Skies" is the 13th chapter of the Dr. Slump manga. The cover art for this chapter is also featured in the artbook Akira Toriyama - The World Special.
Summary

Arale and Taro in the Cola Plane
Envious of flying like Gatchan, Arale Norimaki asks Senbei Norimaki to modify her so that she can fly. Not wanting to give her this ability, Senbei decides to build a plane for her instead. The plane is powered by the fizz from a giant can of cola and allows Arale and Taro Soramame to go above the clouds, where they meet Thunder Ogre Goronbo.