Turkish Airlines offers passengers a flawless journey through one of the most cutting-edge facilities at Houston Turkish Airlines IAH Terminal Many facilities are available at Terminal D, such as duty-free stores, a variety of food choices, and cozy lounges like the Turkish Airlines Lounge, which is open to qualified travelers. Travelers on Turkish Airlines departing from IAH Terminal D should arrive two to three hours before the departure of their foreign flight in order to allow for immigration regulations, security checks, and check-in. 24 hours before departure, travelers can check in online, choose their seats and print their boarding cards from the comfort of their own homes.