No, once you have checked in or dropped your suitcase you cal clear the BP scanner.
The choice of OneWorld lounges at Singapore is quite impressive !


QUOTE=Newbury newbie;35907713]We’ll be flying out of Singapore Changi in a few weeks at 20.25hrs. Intending to use the Early Check In and then explore the Jewell. When I eventually get bored, thirsty and hungry, is there any restrictions on what times I can enter any of the OneWorld business lounges? Like 6 hours before flight time, say?[/QUOTE]