Turkish Airlines has suspended flights to Tehran Imam Khomeini, Esfahan, Mashhad, Shiraz and Tabriz, with no resumption planned before March 28, 2027. The decision follows airspace disruptions linked to the US-Israel-Iran conflict in late February 2026 and US Treasury sanctions announced on September 8, 2026, against more than 27 Iranian airlines and associated entities. Treasury Secretary Scott Bessent warned on September 21 that Iranian airlines would face worldwide grounding from September 23. Continuing service could expose foreign carriers to US secondary sanctions, which can restrict access to dollar-denominated financial channels. Turkish Airlines also removed 11 destinations across Africa and Europe, while Pegasus Airlines halted Iranian routes during the same period. The carrier has not announced a permanent end to its Iranian services, making the March 2027 date appear more like a placeholder than a firm reopening commitment.