Bombing Iran?

Haaretz is saying that according to the Times (London) Saudi Arabia will give Israel airspace so that Israel can bomb Iran. Isn't bombing someone an Act of War? Apparently not, because in 1981 Israel bombed Iraq - specifically their nuclear research facility. Most of the world did not like that, but it was basically deemed a defensive action by President Reagan. And of course, Israel could not have flown over there without help from US satellites showing the way. I won't go into the start of the Iran-Iraq war and how Israel was selling arms to Iran as part of the Iran-Contra fiasco (PBS coverage, Wikipedia).