Freedom Flight is set during the Secret Missions 2 add-on disk to the original Wing Commander game, which deals with the entry of the avian Firekkans into the Terran Confederation, but the Kilrathi show up in the middle of a holy war.
The action centers around Ian "Hunter" St.John, an Austrailian pilot who's a character in the game. This book gives lots of background details and helps to flesh out the personalities of all the Wing Commander characters, and gives a look into the culture of the Kilrathi, since that one of the book's co-writers actually worked on the game.
The plot follows Secret Missions 2 almost exactly, so veteran players will find not much new here, but it is a good, fast read, and hey, it's Wing Commander!
Overall, I reccomend that fans of the Wing Commander games and anybody into military sci-fi check it out.