Russia’s largest private airline says it has received permission to fly over North Korea, currently operating two routes that cross through the country’s usually restricted airspace.

A spokesperson for S7 Airlines said on Wednesday that the firm has relied on North Korean airspace for its Vladivostok-Shanghai route since last November, confirming previous NK News reporting.

S7 also flies over North Korea on its Bangkok-Vladivostok route, the representative told NK News.

“Permission to use DPRK airspace was obtained through standard procedures for ensuring transit flights,” the spokesperson said in an emailed statement.

The routes were “determined by operational efficiency” and