First of all, I can't imagine the strategic plan Israel would employ against Iran. I posted elsewhere that a typical squadron contains about 20-25 planes. Israel would have to fly several squadrons to hit Iran's nuclear facilities (which are scattered across Iran) and that would be about all the combat aircraft that Israel could assign to the attack. Israeli aircraft would have to traverse the airspace of at least two hostile countries. Once over Iran they could encounter Iranian aircraft and flack which is bound to down a few of them. Then there is the problem of refueling since it's a 2,000 mile roundtrip.