Originally Posted by
paperwastage
Depends on your airline too
eg, UA doesn't have early check-in or mobile check-in at SIN, so you have to wait until check-in counter opens (T-3 hour(
SQ and NH did precovid, so did a few other airlines
Now, SQ still allows early check-in (24hr) but not many others
Since OP posted in the SQ airline forum, I'm assuming that he/she is traveling on SQ (and in particular, is departing SIN on SQ).