The Earth Ship is the command center of Sky Force, guarding peace on Earth. There in the ship, scientists of Sky Force developed the Birdonic Waves. The Vyram attack and destroy the Earth Ship which causes the last four Birdonic waves to be scattered on Earth. Chokan and Ryuu manage to escape.
Sky Bases is the high-tech headquarters of the International defence agency known as Sky Force. It launches the Jet Machines for the Jetman to combat the Vyram iun oder to make the Earth safe.