Russia’s Federal Air Transport Agency, Rosaviatsia, has banned its carriers from flying over Syria after a Nordwind Airlines Airbus A320 crew spotted combat activity and felt threatened during a flight from Sharm el-Sheikh to Kazan April 29. The flight landed safely.

At the end of February, Rosaviatsia advised carriers to avoid Syrian airspace, but several smaller airlines continued to use it. After this incident, authorities warned airlines that their “commercial interests can’t prevail [over] the passengers’ security.”

Rosaviatsia reminded carriers that in October 2001 a Sibir Tupolev Tu-154 was fired upon during a Tel-Aviv-Novosibirsk flight over the Black Sea during Ukrainian force maneuvers. All 78 people onboard were killed.

Russia’s largest carriers stopped flights when the original order was given in February. UTair Airline stopped overflying Syria at the end of March, using alternative routes.