According to a Marine Pilot…
In addition to communicating with the local Air Traffic Control facility, all aircraft in the Persian Gulf AOR are required to give the Iranian Air Defense Radar (military) a ten minute “heads up” if they will be transiting Iranian airspace.
This conversation was recorded on the VHF Guard (emergency) frequency 121.5 MHz, while flying
from Europe to Dubai ..
Iranian Air Defense Radar: ‘Unknown aircraft at (location unknown), you are in Iranian airspace. Identify yourself.’
Aircraft: ‘This is a United States aircraft. I am not in Iranian airspace, I am in Iraqi airspace.’
Iranian Air Defense Radar: ‘You are in Iranian airspace. If you do not depart our airspace we will launch interceptor aircraft!’
Aircraft: ‘This is a United States Marine Corps FA-18 fighter. Send ’em up, I’ll wait!’
Iranian Air Defense Radar: (no response …. total silence)