Since I am the one who made that shot, I can explain:
First, I used "Freecam" view, using F11, and placing the camera somewhere far away from my plane. Then i hit CTRL-F3, and the view will snap to your plane, and start tracking you (just the same as hitting F3, flyby view).
Then I slowed time down some, and recorded. When i saw the mav beeing launched, I paused the sim, hit CTRL-F11 to go back to freecam mode, then hitting the "follow ordnance" key, or whatever it's called. This way the camera will track bombs, missiles, etc..
Then i resumed the recording.
And during editing, the 2 shots were alligned perfectly to make the transition seamless.
A similar shot was made in this scene: