I don't know how many "but, but, but" folks here have access to the Internet, but if you do, check out some of the designs for aircraft.
You think a "double tap" or "triple tap" is bad (when you post but you hit the submit key because you think you had trouble and then.... poof, you have two to three of the same posts), the system is a redundant system. There is more then one (up to four in some cases, depends on the aircraft) system for each that will bring the plane down safely.
If you notice, most aircraft are brought down by total engine failure, lack of power (due to engines), and things falling off (like the tail or a wing).
Then you have to check out the aircraft that were used in war. Big planes like the bombers and even the fighters. Sure, a missile (which is a high explosive) will bring them down, and in the old days, many rounds (unless a lucky hit) would bring them down. Then check out what type of rounds they were using and at what amount they were being sent at the plane.
And not all of them fell from the sky, many made it home so riddled that people wondered, how the heck did they make it home. They did so because the plane was made for it.
Air Force in case you are wondering
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Guns on planes (and if it were so bad, why do the AM's get to have guns? ) are not the problem and before 1960's (I don't know the year that they banned guns from Aircraft, commercial) they were never a problem.
From what I've seen, people of another country with box cutters, were the problem.
Wayne