THAI Smile Airways was a Thai regional airline and a was wholly owned subsidiary of Thai Airways International headquartered in Bangkok. In 2023, it was announced that Thai Smile would be merged into its parent company Thai Airways. The airline merged into Thai Airways International on 31 December 2023. The full cessation of operations was fully effective on January 1, 2024.

Thai Airways International Public Company Limited, trading as THAI is the flag carrier airline of Thailand. Formed in 1961, the airline has its corporate headquarters in Vibhavadi Rangsit Road, Chatuchak district, Bangkok, and primarily operates from Suvarnabhumi Airport. THAI is a founding member of the Star Alliance. The airline is the second-largest shareholder of the low-cost carrier Nok Air with a 15.94 per cent stake (2020), and it launched a regional carrier under the name Thai Smile in the middle of 2012 using new Airbus A320 aircraft. In 2023, it was announced that Thai Smile would be merged back into Thai Airways.