Russia’s largest private airline has begun routing select flights through North Korean airspace, NK News analysis of flight-tracking data shows, likely netting Pyongyang overflight fees.

A Boeing 737 (tail number RA-73668) operated by S7 Airlines first entered DPRK airspace on Nov. 12 on a flight from Vladivostok to Shanghai, according to Flightradar24, a shift from exclusively using Chinese airspace for the route.