In what version of the movie did you notice this ?? In my version (DVD region 2) there are 5 jets both before and after they fly under the bridge.
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sanych writes:
Only five go under the bridge. But... If you follow the airstrike from the
beginning then you see that there are 5 planes. A little later when the
planes are shown in the sky going to the target we see 6 planes. And again
a little later in a scene with the bridge there are 5 planes again! I guess
1 plane that joined on the way finally chickened out!