In the "Shattered Skies" mission, the fast moving plane you are locked onto when the mission first starts is an SR-71. You can shoot it down by heading towards the back of the combat area and climbing to about 30,000 ft. Head it off and you should be able to shoot it down. Quickly tap the Analog-stick Down as the mission starts. If done correctly, the SR-71 (which is the orange triangle) should still be blinking. This is the chance to get the Sr-71. Using the X-02 is recommended, due to its powerful speed.