on 4.5 (the final count down) there will be times when you have to stay alive all you have to do is keep on going up this will make you leave the combat zone buy noone can shoot you.
Successfully complete the Pilot bonus objective for the final mission (Mission 4.5-Final Count Down).
Successfully complete the Ace bonus objective for the final mission (Mission 4.5-Final Count Down) to unlock the super weapon. This weapon is used by the SR-71 Blackbird and does not recharge/reload once fired.
On mission 1.3 when you have to take off just pause for a while and then hit the throttle barley, BARLEY!! and then you cant move and rumbler will come in and say the mission over and all that junk. And now you've beatin the mission.