The possibility of a sneak attack is worrisome, as the military is demoralized and gutted under Obama. Remember that the reaction to the 9-11 attacks was lethargic to say the least. As I recall, the only available fighters in the Northeast belonged to the Massachusetts National Guard even though we had no overseas engagements at the time of the attack. Crashing a passenger jet into the Pentagon itself was inexcusable and demonstrated poor preparedness.
The only saving grace is that if Iran were to undertake a sneak attack, it would be signing its national death warrant.
Wash DC Air National Guard was up.
From take-off at Dulles to the Pentagon is mere minutes.
Physically impossible to react in time to stop it.