Did you check your enviormental settings? That will screw it up.
Also, i'm not 100% positive, but i think what dictates if a plane will attack or not, is if it has any bombs attached to it or not. If the game spawns a plane with no bombs, i suspect it will cruise right on by, and not make the slightest inclination it spotted you.
Also single missions are poor test beds for planes. For some reason they have never behaved in single missions exactly like they will in the campaign. I could be wrong in that though.
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