Originally Posted by
CaptainProp
Notam A0019/19 was issued at 0148 UTC, June 21st
All US operators are prohibited from entering the Tehran FIR in the area above the Persian Gulf and Gulf of Oman.
Precedent would suggest that many other non-US operators will also observe the restriction, even though not bound by it.
Other than Qatar and Gulf Air, there's not much evidence of other carriers currently transitting the Tehran FIR.