Can aircraft be intercepted more than once per attack? If you attack a city with three SAMs in there, is there ever a chance that all three SAMs will intercept.
No
Can units intercept aircraft more than once? If I attack a city with a single SAM, can it intercept five aircraft attacks in a single turn?
If you attack with 6 planes at once, it can only try to intercept one. If you attack one at a time, I think it gets a shot at each.
Does having more SAMs in a city increase the overall interception chance?
I don't think so, but I can't swear. I never see the AI put more than one SAM in a city.