An AC-130 gonna really make it that far in to restricted air space?

commercial airlines would get taken down if they even gotten that close. (nevermind how they even got it that far in the first place...because you aren't just going to steal a military aircraft from a base without causing a national incident, and there's no way it flew across the borders and got passed the Navy and/or homeland security lmao)
SAM turrets only had one shot/one opportunity to take it down as well?
The military officials and cabinet members didnt know about that advanced turret?
All the members that knew the nuclear codes where kept in the same locations? And as an aside, if you have that responsibility you can't give those codes up even with some torture or the threat of losing your life or whatever.
If you suspend belief, its a good popcorn flick. Lots of pot holes though.