Originally Posted by
hdogan
So then why even clear immigration first time? Get a flight that lands at Changi some time before your friend's flight, stay airside until he arrives, meet him, clear immigration together, go see Jewel, and go back to the airport together. There's no arriving/departing passenger separation at Changi, you'll be deplaned in the public airside area of whichever terminal you arrive to, and they're all connected (at least terminals 1-3, T4 is a bit of a hassle).
When I posted my original question, I did not know this was an option. After posting, their customer service contacted me and this is what my 9:44 ICT comment was about.
What you’re describing is also what their customer service agent suggested as a solution.