HOW DO I UNLOCK THE SEA VIXEN??????

First all.. If you search (www.Ign.com/Airforce Delta Strike) go to images and you'll see you picture of the sea vixen in the game. It's default color scheme what it looks like is light blue & glay color, but if you played this game.. That's the color of Brian's planes , so that means it's brian's plane! So everytime you choose the 2nd element missions to play as Brian, I GERENTIE you will not unlock it! Maybe you have to complete ALL missions with the 2nd element, or secret mission or some way to unlock it. If ANYBODY knows how to unlock the sea vixen.. Let me know because it's the aircraft number (91). Because I tried looking ALL over the Internet for AFDS cheats how to unlock it ,but it shows you other cheats like how to fly as Ellen, selfstruct and secret planes.. I KNOW how to do that, all I wanna know to how in the FK do you unlock it. I'm not upest or anything but this just a story this plane that is VERY hard to unlock! Anyone is a fan of this game, i am too because Im a flight simulist which means I'm an huge aircraft collected of this game am not BEST player which is I mean.. But im just saying.................. THAT'S BULLSHIT! thank you