Thai Airways have listed 34 used passenger aircraft for sale on this website.
The aircraft for sale include: A300-600, B737-400, B747-400, A340-500, A340-600, B777-200 and B777-300.
The list included THAI's entire B747-400 fleet. Although there is no official confirmation, this is an indication that THAI will retire all their B747-400 fleet.
THAI is also selling their entire B777-200 and B777-300 non extended range fleet (original A model).
We knew that THAI had retired and parked their A340 fleet for sometime, in Don Muang and Utapao Airport; they are still trying to find buyers for these planes.
For anyone who is interested in purchasing these aircraft, you can email here.