Bozon's post above seems to be right mathematically, but even that does not take into account the co-ordination between tank crews, and the time delays involved with that. Shooting a plane moving 250 laterally and vertically with a gun that was designed to shoot tanks on flat ground, is gamey a best.
And no, the object of the discussion is not necessarily that it is possible with the plane flying directly at the gun. Even that shot in real life would be hard to make because by the time the commander had got the gunner lined up on target (assuming the tank was actually pointed in at least the general direction the plane was coming), the plane would probably have already flown over the tank. The true gamey aspect is the shot that are 2.5k+ out, with movement through several different planes.
The factors that make these types of shot near impossible (or more of an impossibility) in real life are not accounted for in Ah2. In short, the time delay in co-ordination of the crew, wind (which probably has a quite noticeable effect on tank rounds, due to size and ballistics), and probably even barometric pressure and heat of the gun itself (I know both of these factors are taking in quite heavily when aiming large AA guns).
At the same time, those arguing against it are not taking into account most of the reasons it can happen too. Mainly:
1) Sheer number of opportunities (you can't compare the amount of combat time we get to "real life")
2) Ability to "learn" from your previous mistakes (you don't die)
3) Unrealistic attack angles from the aircraft (slow level attacks lining up from a distance? lol)
I can tell you the planes I have shot down have been under three circumstances:
1) (Least Common) Plane attacks the rear of my tank, over flies and goes straight away from me. This puts them right in my gun sites but flying away. I rarely hit this one.
2) (Second most common) Plane does attack number one, then does a 180 and comes straight back. Since I was already trying to line up for the shot in part number one, this is an easy hit. I just wait until about 600 yds then fire with the aim bar at ~500. Something a real pilot would have never done.
3) Plane has upped and is moving towards me from the airfield. I've been watching it for 10k+ yards, waiting for it to come in to attack. Easy shot, and something a real pilot would have never done because of the danger.
I have shot down probably 20 planes, but have died 100s of times to them. I would have never figured out how to make those attacks if this were "real life". Plus the pilots I hit are always doing something to make my life easier. I'm not a very good shot (1.78% hit rate in planes, hehe) yet I have a 6%+ hit rate with tanks, even though I return to the field without ammo for my machine guns almost every time simply because the planes are LETTING me dump ammo into them. I've lost count of how many planes that have left smoking because they approach nice and slow and I fill their engine with .30 cal. I rarely drop one before I die, but that tells you exactly how most of my adversaries are flying.
You don't want to get hit by a tank? Increase your attack angles, be aware of where the enemy's field of fire are and don't let me follow your movements for 1+ minutes to line up for the shot. If you don't follow those rules in real life you die too
And come play in a GV. Try to kill a plane yourself and see how far you get if they do things right.
