My promotions so far have been booked with booking code W
Not sure you can see the booking code at the time of online booking...
Hesitating to book next trip with EY, if no chauffeur the only advantage I have versus QR is the 10kg extra my silver status gives me (lost gold and if next trip is EY will have gold again - within the 12 month period) Upgrading with miles is not worth it for 2 segments aka 60K miles.
I fly 2x year BKK-BRU in J.
I guess I will choose whatever comes cheaper QR or EY