Iran has a third world airforce. They could defend against them with .50 cal machine guns.
Wrong.
Iran is capable against any country except the US/NATO, Russia, or China. And Iraq has no air defense ATT.
Ma duece has not been a practical air defence since the 50s.
If we left Iraq today, Iran would own Iraq’s airspace.
http://www.mnf-iraq.com/index.php?option=com_content&task=view&id=27922&Itemid=128
“First Lt. Waad Shuhatha recently became the first post-war Iraqi service member to earn a certification in air traffic control from the International Civil Aviation Organization (ICAO), continuing the transition of military training and assets to the Iraqi armed services.”