Based on everyone's experience, what are the chances of SQ releasing a flight that currently is not available ? Booked using Aeroplan (part of an award ticket), I'm on SQ631/186 but want to change to SQ635/178. Spoke with Aeroplan and they said that there's no availabilty on SQ 635 , otherwise they would do it. Not travelling until January next year, so I've got lots of time. Is it possible that SQ will release seats for SQ635 ? I assume a monthly call to AC might be the way to go. I am not able to do the change online. Any suggestions for conversations with SQ ?