I can't believe this is still alive.
Just booked a second ticket RGN-SIN-LHR-JFK... issued on SQ stock within 5 minutes from Travelocity.
Early yesterday I booked RGN-BKK-FRA-JFK (TG/DL) issued on DL stock.
I feel the TG/DL ticket might have a little better chance of sticking than the SQ/DL ticket (but I would rather fly the SQ ticket!)