What airspace will they use? In order to Bomb Iran they have to cross an Arab state. US will know about those plains once they cross the borders. They have listening posts in Iraq, Saudi, and in Kuwait. Not to mention Turkey. You can’t fire a bunker buster bomb from a sub. They will always have the option of feeding that information to Iran letting them know they don't support the bombing. And US military will not need the permission of congress to do this. Once the first plain is shot they fleet will return home bruised. If Israel that use has no option they better think again. There is always a simple solution to complex issues.