After you have shot down an ace on a level, highlight the plane that he was flying in the hangar. Press Down after you have acquired or purchased the color. If it is the correct paint job, you will see the letters IF.I.A.IF. somewhere on the plane. The SU-37 has Yellow 13's paint job, the X-02 is white, since there is not an Erusian version. Also, the F-14 does not have the letters F.E.A.F., but has the Erusian symbol (an orange triangle with a white circle inside).