Northrop Grumman B-2 Spirit

It's the first Easter egg plane in the game, and the first plane with ability to fire missiles.

You can find the plane on level 5.

Its weapons and bombs can't be upgraded but the missiles can be upgraded up to 7 times.

Trivia

 * It is a real life plane.
 * It was created in the cold war period.
 * Getting this plane gives the player a huge advantage in level 6.
 * In the carrier menu, the plane's name is wrong, it is called by the name of another plane: "Lockheed Martin F/A - 22 Raptor"