I have just had a holiday in Thailand and had a flight booked with Nok Air from DMK- CNX (Bangkok Don Mueang-Chiang Mai).
My ticket was Nok Plus which is a premium economy type seat, on checking in I was told this wasn't available and they gave me a small refund.
When the aircraft pulled onto the stand it was a XL 738 G-OXLC (I think)
Had a look on airliners.net and it would seem XL have another aircraft with Nok Air for the winter.
British pilot, co-pilot and purser plus 2 or 3 Thai FAs.
Nice flight but not much room.