The Civil Aviation Authority of the Islamic Republic of Iran (CAA.IRI) has issued a Notice-to-Airmen (NOTAM) for Iranian Airspace, closing all but a handful of airports in the western part of the Tehran Flight Information Region (OIIX), which will only be open for commercial flights from Sunrise to Sunset. The NOTAM will be in effect from May 22, 2026 to May 25, 2026. All flight operators are still required to receive permission from the Civil Aviation Authority for any flights over or into Iran.