Join Date: May 2004
Location: SIN (LEJ once a year)
Programs: SQ, LH, BA, IHG Diamond AMB, HH Gold, SLH Indulged, Accor Gold, Hyatt Discoverist
Posts: 8,815
Hmm, what is your destination on SE Asian that you take the TR flight for? For starters TR only offers ScootBiz on 787 aircraft, so if yours isn't one you definitely are in normal Eco.
If the flight is operated by a TR B787 then it depends on the fare class (fare bucket), but hopefully, if sold in conjunction with a SQ Biz flight it would book you into ScootBiz.