Air superiority was established fairly early on in the conflict. Flying F-15 and F-16s now. Not even stealth and they drop more than just missles - they carry bombs. B-52s weren’t sent in to carpet bomb the area of that’s what you mean.
US could indiscriminately drop dumb bombs but you would have a higher civilian casualty rate.
> Flying F-15 and F-16s now.
Except not really. If they were willing to risk sending many aircraft deep into Iranian airspace with SDBs and JDAMs they wouldn't be running out of ballistic missiles.