Airports of Thailand Public Co. Ltd. engages in the operation of airports. The company is headquartered in Bangkok, Bangkok Metropolis and currently employs 8,878 full-time employees. The company went IPO on 2004-03-11. The firm's market segmentation includes aeronautical and non-aeronautical. Its aeronautical market segmentation includes aeronautical activities comprising landing and parking charge, departure passenger service charge and aircraft service charge. Its non-aeronautical market segmentation includes non-aeronautical activities comprising office and state property, services and concessions (consisting of various activities, including advertising and public relations, financial business and office building services). The company operates various airports, including Suvarnabhumi Airport, Don Mueang International Airport, Chiang Mai International Airport, Hat Yai International Airport, Phuket International Airport and Mae Fah Luang - Chiang Rai International Airport.