Turkish Airlines and United Airlines have revised their codeshare arrangements, effective 2 July.
United will now place its code on Turkish flights from Istanbul Ataturk airport to Adana, Antalya, Bodrum, Gaziantep and Kayseri.
Turkish will place its code on United's services from Chicago O'Hare airport to Atlanta, Dallas, Denver, Las Vegas, Minneapolis, San Diego and Seattle; from Los Angeles airport to San Francisco; and from Washington Dulles airport to Boston and Orlando.
The changes mark a reduction in cooperation between the two airlines, which had previously codeshared on the Turkish flag carrier's flights to Europe as well as United's transatlantic service.
Separately, Turkish has informed Istanbul Stock Exchange that it will open new routes to Isfahan, Kermanshah, Kilimanjaro, Mombasa, Luxembourg, Aden and Luanda this winter.