Originally Posted by
1000k00
Yes you should be able to check in 48 hrs ahead using OLCI(PNR or Passport #). If you happen to have a UA flt connecting to SQ be mindful to check in for the UA flt first at 24 hrs then the SQ flt second if on same PNR.
You should be able to call SQ referencing their flt # and be able to select your seats now if you already haven't.