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I agree they know who you are by the passenger itinerary even before you get through the gate with passport. Americans are targets in these countries.
Here’s my suggestion: STOP TRAVELLING TO IRAN. >

And russia >

Stop going to these countries. An American passport is just a red flag to these anti western regimes. There is a good chance you will be detained over some bogus charges and used as a hostage and propaganda tool. Why people take these risks.