My Dad (PPS Solitaire) does this regularly and he says it's got fairly decent loads (70-80%) granted he flies during peak business days.

TG does not command nearly as hefty of a premium for their C that SQ does, so SQ likely has a profit whereas TG struggled to break even.

For meeting in CDG that turned into an NRT meeting, on a <24 hour notice, TG C priced out at 3620 Euro and TG F at 4810 Euro for CDG-BKK-NRT versus SQ wanting ~7000 Euro and 13000 Euro for C and F on CDG-SIN-NRT .