So a friend booked 12/31 HKT-NYCx4 and I booked BKK-NYC 11/29x2 today (~43k THB). Clicking through google flights did not not work, as it seems SQs website prices BKK-EWR different from BKK-NYC. Was able to book and both chase/amex failed on SQ's site but chase worked through Paypal.