I've used the Jewel early check-in at SIN a number of times, always on QR, and always when travelling alone.

But - if two or more people are travelling together, do all passengers need to be present at the early check-in? Or is just having all the passports there good enough?

And if it is not possible to check-in early with one or more passengers not physically present, is it possible for only some of the passengers to check-in early?

Many thanks.