The US Treasury's "Operation Economic Outcast" has extended secondary sanctions to Iran's aviation sector, targeting not just airlines but the entire support ecosystem: ground handling, ticketing, fuel suppliers, and airport services. Washington cannot order foreign airports to refuse Iranian planes, but it doesn't need to. The threat of losing access to the US financial system does the work. Airports, fuel companies, and ground crews in Baghdad, Muscat, Baku, and Tbilisi have already walked away. The stated justification is the documented dual-use of civilian aviation for military logistics. Mahan Air's ties to the IRGC are well-established, and former Foreign Minister Zarif publicly acknowledged in 2021 that Qassem Soleimani used civilian aircraft to move forces and equipment to Syria. Washington treats these links as proof that the civilian-military boundary is porous enough to sanction the entire sector. The immediate damage is not to GDP — Iran's aviation sector is small by regional standards, with roughly 150 aircraft in the operational pool and only about half flyable at any time. The damage is to connectivity. Iranian carriers served as feeder links to regional hubs like Istanbul, Muscat, Baghdad, and Yerevan, where passengers transferred to foreign airlines. Those first-leg connections are now disappearing. Turkmenistan refused airspace transit on September 24 for a Tehran-to-Dushanbe flight, forcing a return to Iran. Even confirmed bookings no longer guarantee departure. The suspension of the J-1 general license — which had allowed non-Iranian aircraft to make temporary stops in Iran — widens the blast radius. Many commercial aircraft contain US-made parts or technology, meaning any operation touching Iran can trigger sanctions exposure. This puts foreign airlines, lessors, and service providers on notice: the legal and financial risk of any Iranian aviation contact has increased. Passengers are adapting by crossing land borders. One traveler whose flight was canceled described traveling overland from Iran to Turkey before flying from there to Istanbul. The border was "very crowded," he said, with people worried routes might close. For students, patients needing medical treatment abroad, elderly travelers, and families, a journey that once required a single ticket now demands road transport, accommodation, visa costs, and multiple connections. Air freight is also affected — urgent goods including medicines, medical equipment, industrial parts, and laboratory samples that once moved by air now face the same disruption. This compounds existing restrictions on maritime trade: disruption around the Strait of Hormuz, elevated insurance and freight costs, and pressure on southern ports were already squeezing imports and exports. Iran is being cut off simultaneously by air and sea, leaving land borders and indirect routing through neighboring states as the primary remaining lifelines. The structural picture is one of compounding isolation. Iran's transport minister has acknowledged flights operating without radar guidance. An aging fleet, chronic spare parts shortages, and decades of sanctions had already degraded the system. The new measures don't destroy a functioning network — they accelerate the collapse of one already running on margins too thin to absorb additional shocks. Political economy analyst Alireza Salavati frames it plainly: for patients, "a once-direct journey can become a detour through a third country, with extra travel, accommodation and sometimes visa costs. Time can matter as much as money."
