All major metro areas now have permanent US fighter protection.
In fact , for the first time ever, NATO (not US) E-3 Sentrys have been dispatched to the United States for continental protection duties.
Let's face it kids, if even just one tenth of the Muslims on Earth want to see harm come to us, that's 100 MILLION people. And now they know an effective and simple to use weapon of mass destruction is a jetliner.
Want my opinion? One will have to be shot down be New Years.
You know what I just spent 10 minutes typing out the scenario I think is most likely, and then erased it all. I'm not posting it here. One less idea to clue in whatever evil scumbag might be lurking about.