Two things Iran failed to achieve since the 12 day war
1) take control of it's airspace
2) protecting their top leadership.
Point #2 is also related to point #1, since Iran has no control of it's airspace, the Americans and the Israelis are striking with impunity.
Wonder if Iranains have any shoulder fire SAM system. They won't be of much use against the likes of B2 or B52 or F35 but they can certainly down the F16s, 18s which are now flying at a very low altitude.