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 Defence Radar (military) a ten minute 'heads up' if they will be transiting Iranian airspace.

This is a common procedure for commercial aircraft and involves giving them your call sign, transponder code, type aircraft, and points of origin and destination.

The following was reported by a  pilot who overheard this conversation on the VHF Guard (emergency) frequency 121.5 MHz while flying from Europe to Dubai .

The conversation went like this...

Iranian Air Defence Radar : 'Unknown aircraft you are in Iranian airspace. Identify yourself.'

Aircraft : 'This is a United States aircraft. I am in Iraqi airspace.'

Air Defence 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!'

Air Defence Radar : (No response ... total silence)