Plane Rank increases when you obtain a plane that you already have.

When the rank of a plane increases so does the ability of the plane.

■ Ability increase amount by rank

Second Lieutenant -> First Lieutenant : ATK 5%

First Lieutenant -> Captain : DEF 40%

Captain -> Major : HP 40%

Major -> Lieutenant Colonel : ATK 15%

Lieutenant Colonel -> Colonel : ATK range 40%

Colonel -> Brigadier General : Piercing 40%

Brigadier General -> Major General : Turn Rate 10%

Major General -> Lieutenant General : Max Speed 10%

Lieutenant General -> General : ATK 20%

※ Once you reach General, the same planes are turned to materials automatically.