Southwest Airlines announced a partnership with Turkish Airlines to offer travelers one-ticket, transatlantic journeys between the US and Istanbul, unlocking onward connections across both carriers’ networks. The arrangement is scheduled to begin early next year.

Turkish Airlines, according to the announcement, flies to more than 350 destinations in 132 countries from its global hub, Istanbul Airport, including 10 airports in the US served by Southwest. International travelers, said the announcement, will be able to seamlessly connect through those shared gateway airports.

Andrew Watterson, COO for Southwest, said the carrier “is grateful for this new relationship that will usher thousands of international travelers each week through experiences around the globe that showcase the best of both carriers and globally enhances awareness of the Southwest brand.”

Southwest has announced six partnerships with overseas carriers this year, connecting its network to destinations in Asia, Europe, the Middle East and Africa. The airline will begin offering bookings for assigned and extra legroom seating on flights on Jan. 27.