**US sanctions targeting Iranian carriers since September 23 have sharply curtailed international flights from Tehran, producing a 42% drop in daily operations and halting routes to several neighbors, though Iranian carriers continue limited services on select corridors.** A brief five-hour general airspace closure occurred around October 1 amid elevated US-Iran tensions and domestic protests, but operations resumed quickly without broader suspension. Prior full closures followed February 2026 strikes, after which the Tehran FIR reopened partially under strict military-risk advisories from EASA and other regulators that remain in force through mid-November. Trader pricing for near-term resolution dates reflects the absence of sustained general closure despite these pressures, with diplomatic appeals to neighbors and narrow sanctions waivers illustrating ongoing but contained disruptions rather than escalation to comprehensive shutdown. Scheduled events such as protest developments or further sanctions enforcement could still influence outcomes within resolution windows.