What a stupid way to deliver that nuke! Could not fit lead shielding in the Cessna nor air scrubbers. Can do so in an SUV -- ANS in an SUV you already have thens of thousands of them in the Beltway. Use some simple logic. Stop the panic, already.
ANS = AND
SUICIDE BOMBER!
An aircraft can get past barriers that a truck cannot. A truck cannot drive through the whitehouse door. A plane can.
It doesn't even have to be a bomb. It can be a pilot and 200 pounds of C4. 200 pounds of C4 would make a BIG explosion.
True, a radio controlled "whatever" would have worked nicely..