dude we have been through this there were mutliple attacks on the us mainland by seaplanes carried in a sub. look it up.
like i said in my previous reply:
The Japanese did that, i only believe once tho. They were off the coast of Oregon i believe, they lunched a biplane with incendiary bombs. They intended to start huge forest fires, hoping that it would delay the US from attacking them. But it was a "successful" mission in part of the plane lunched and was recovered, but the forest fires they intending on starting was a bust.
Now another time a japanese sub surfaced off the west coast and opened fire on a fort or factory, something like that, but damage was minimal.