NRSA travel to GUM

hey.... was just wondering if anyone knew what it was like to nonrev to Guam from Japan in the summer months as an S4 on DL? There are many flight options from NRT/KIX/NGO... but not really sure if this is a peak travel time or destination. Any help would be great! Thanks!!

PS. Some of the flight show only 20-30 avail seats, but looking at seat maps, it appears 95% of the plane has open seats, and some of the Business cabin shows 20 avail and 0 authorized.. any idea what that's about?

I have never been myself. I have been to mnl a couple of times and its usually the same situation where coach is oversold by 30 and First has a lot of open seats. many of my coworkers go to GUM and our priority is just above S4 for AS/QX airline employees. I could be wrong but i think they put in S4 pass riders in first class. So even if coach is oversold you wont have problem getting on. At least that is my experience .