[Imp]

Thats some pilot if the plane took 250pts of damage & it still managed to carry out its attack.
Works exactly the same as fire at any other unit, hit & damage say a tank other units will continue to fire at it.
Also with Sams that engage the plane before it fires in other words as enters the map they would already be in the air by the time the first hit anyway.
Beyond the capability of the game but only way would be to have radar units linked & fire a set number at each plane regardless of whether the first one destroyed it or not.