I was in that airport last year on the way to Cebu and Palau. There’s a shuttle bus and it’s free. If you have the energy, you could even leave the airport and check out the Mall of Asia...huge! In good traffic only a 20 ride from airport. There’s a luggage storage area as well. 7 hours is a long time to be stuck in an airport. Might as well get some culture while you’re there.