The Aegir Fleet is a fictional fleet from Ace Combat 04. The fleet was nicknamed the 'Invincible Fleet' due to it being the largest fleet of the Erusean Navy. The destruction of the fleet is featured in and the main part of Mission 6 'Invincible Fleet'.
Among the ships in the fleet were its flagship Iowa-class Battleship 'Tanager' and the Kitty Hawk-class Aircraft Carrier 'Geofon'.