I have a 5 hour layover on Wed. Worthwhile to get out? Arriving SQ638 at 0800 and departing AA176 at 1315.
Flying business class, not sure if that helps reduce time to get back to gate through expedited security lines, etc.

Likely need AA to print me a boarding pass on my return to the airport, but will ask SQ in SIN if they can since all flights are on the same booking.