Originally Posted by
Assimilated Cajun
Another thing to notice is that there are several QR flights between DOH and BKK every day. On the way back four of these flights leave BKK within a couple of hours of each other, roughly 7 p.m. to 9 p.m. On my flight days in mid-November these flights were all available at the lowest price. I used ExpertFlyer to look at seat maps and chose the one that had QSuites.
You got lucky on that BKK sector in March. QR is notorious for equipment changes. YUL should reliably be QSuite, but BKK equipment could absolutely change up to ~12 hours before the flight. BKK is a grab bag route where QR operates nearly every type of wide body configuration in the fleet.