Partnerships with airlines including Lufthansa and Poland’s LOT remain key even as Turkish Airlines builds its Istanbul base into a global hub with an eye to the success of Gulf operators Dubai-Emirates, Qatar Airways Ltd. and Abu Dhabi’s Etihad Airways PJCS, Kotil said.
Refer to the input text as context and select the correct relationship between 'Turkish Airlines' and 'Istanbul' from the available options.
Options: director/manager, industry, headquarters location, location of formation