Add-on to X-Wing vs. TIE Fighter.
It adds several new ships, including the Imperial Super Star Destroyer and the B-Wing as a flyable ship.
The all-new campaigns add a story to the game: they tell of the battle between the Empire's Avenger Squadron and the Rebels' Rogue Squadron in the Airam Sector; new cutscenes continue the story between the missions.
In addition to the campaigns there are also new melee and combat missions, as well as other miscellaneous improvements.
As in the original game, all missions can be flown in both single player and multi player mode.