This is a part of the final descent towards CNX (Chieng Mai International Airport) on a test flight of the brand new A350-941 aircraft of Thai Airways International. This was the very first A350-900 of Thai Airways International, officially named วิเชียรบุรึ Wichianburi, and shot only a few days after it’s maiden arrival in Bangkok.
https://www.youtube.com/watch?v=emVbk1hEW8g
