Japan Airlines Co. and Russia's S7 Airlines are starting joint flight operations on routes linking Tokyo and the eastern Russian cities of Vladivostok and Khabarovsk, Russian sources said Monday.

JAL will be selling seats on S7-operated flights on the routes starting Wednesday, while S7 will be selling seats on five JAL-operated domestic flights from Narita International Airport starting Feb. 15. S7 uses Narita for its Tokyo services.

The two airlines also plan code-sharing on JAL's Tokyo-Moscow services as well as other S7 flights in Russia, where both sell seats on each other's flights as their own by adding their own flight numbers.