Thailand has a number of airports that service both domestic and international air traffic, as well as many more that only serve domestic flights. Domestic carriers, such as Thai Airways, and international carriers, including AirAsia, fly numerous domestic and international routes into and out of various Thai airports. Bangkok’s Suvarnabhumi (BKK) is the premier Thailand airport and serves as a hub for international transit passengers as well as a gateway to various Thai destinations. Phuket (HKT), Chiang Mai (CNX), Hat Yai (HDY), and Koh Samui (USM) are the other primary airports for international air travel into and out of Thailand. For domestic flights to travel to smaller provincial capitals one must generally fly out of Bangkok or one of the other international airports listed above