Can't select IKA (Tehran) as destination in Orbitz
Hipmunk directs me to Orbitz for an itinerary going to Tehran.
However, IKA (Tehran) airport does not appear on the Orbitz site. I get a message saying, "Sorry, we cannot find a match. Please check the spelling and enter a city name or airport code." when I enter it.
Expedia doesn't seem to list IKA either. Travelocity lists it.
Why do some travel sites list IKA and others don't?
Thanks.