For anyone who needs United PQD, this fare can be plated on United (016) ticket stock; it's available on United.com. Note that the number of redeemable miles for a MileagePlus member will be much higher if booked on a non-United ticket, but those would earn 0 PQD.
Meanwhile, Miles & More participants will get much better earnings by booking this on United (2 x distance instead of 4 / €)
ETA: Other Thai airports seem to be available also; it prices out from HKT and CNX, for example.