What I had in mind was that if you earned a plane, you kept it. You could fly it at any time, but first you had to earn it. But, after a few real wars, everybody will have the planes they want, so at the end of each tour, reset the perks to zero. Now, a player must earn the planes by actually playing the game the way it was ment to be played. Attacking and defending the bases. Shooting down a 262 will earn a person no points, but shooting down a bomber will earn some. Bombing an airfield will earn more.