Don Mueang International Airport is the oldest and most important international airport in Thailand. Located in Don Mueang, Bangkok, it is the second-largest airport in the country, after Suvarnabhumi Airport. It handles both domestic and international flights and is the hub for low-cost carriers, including Nok Air, Thai AirAsia, and Thai Lion Air.

The airport was first established in 1914 and was then known as Don Muang Royal Thai Air Force Base. In 1924, it was officially designated as an international airport, becoming the first in Southeast Asia. The airport was a major military base during the Vietnam War, and was used by the United States Air Force for refueling.

The airport was originally known as Don Muang Airport, but in 2006, it was renamed Don Mueang International Airport, in honor of the late Prime Minister of Thailand, Field Marshal Plaek Phibunsongkhram, who had served as the Minister of Defense from 1934 to 1938.

The airport code, DMK, was determined by the International Air Transport Association. The first two letters stand for the city of Don Mueang and the third letter stands for the country, Thailand.

At present, Don Mueang International Airport serves more than 75,000 passengers daily and has over 600 flights per day. It is the hub for low-cost carriers, including Nok Air, Thai AirAsia, Thai Lion Air, and VietJet Air. It also serves international carriers, including Air China, All Nippon Airways, Cathay Pacific, China Airlines, Emirates, Etihad Airways, Jetstar Asia, Korean Air, and Qatar Airways.

Don Mueang International Airport is an important hub for both domestic and international travel in Thailand. With its large number of flights and convenient location, it is a popular choice for travelers from all over the world.