Thai Airways

Airline
BKK: THAI
Thailand

"Thai Airways International in late last week’s inventory update closed reservation for service to Iran, currently served 4 times a week. Reservation for Bangkok – Tehran Imam Khomeini route, on/after 01MAR18, is no longer available for reservation." (January 29, 2018)
 

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"Iranian president Hassan Rouhani arrived for the summit in Bangkok, marking the first Iranian presidential visit to the Southeast Asian nation... Thai Airways and Thai AirAsia X started selling direct flights between Bangkok and Tehran this year in a bid to attract wealthy tourists from the Middle East." (Reuters, "Thailand to revive Iranian economic ties through rice deals, trade," 10/10/2016).