The USA would have complete air superiority from the outset, Iran's small, obsolete airforce wouldn't survive an hour. Without air cover, Iran's ground installations, coastal missile and SAM batteries, Bandar Abbas naval base and fleet (such as it is) would be out of action within a day or two. As in Libya and Serbia, without control of the air, everything on land or sea becomes a sitting duck. The USAF's technology on missile supression, radar targeting, long-range strike capability etc is far too advanced for Iran to even start to compete. This is just sabre-rattling for the domestic audience, no sane military commander would get into this kind of one-sided fight.
First refugees travelling on Hungarian bus arrive at Austrian border (Reuters)
from the article: Iran official: U.S. cannot stop us from cutting off world oil supply