Nok is still flying, just not to Buriram. I see their planes zip past my window many times every day, with the very recognizable design. Flew with them domestic, and planes were hit and miss, some looked like new, others really needed new seats (though leg space is way larger in Nok than it is with Air Asia, and I believe same or more than Thai planes used for domestic routes). But as they have a Boeing 737 fleet, I'm less inclined to choose them than those using Airbus A320, like Thai or Air Asia.