I have tried 3 more times
The two firsts the flak issue occur! In the fly route, the flaks starts to shoot! When they hit 2+ birds the fly wing break and starts to turn around and some dive as I said.
In the thirty attempt we pass the "red point", but I get killed ! Sad, but Ok!
Only me and my wingman goes to the check point and the event don't trigger ! We lose much time to fly all the path again.