If every IRROP for every airline in the world was posted, this thread would be thousands of pages long. I've been to Chuuk (formally Truk). There aren't a whole lot of flights, and frankly, it's nice to have UA going there. They're not gonna run 2 flights a day there. The milk run it what it is. Stuff happens. Scuba equipment can be rented there. Most of the diving is in the shallow lagoon and equipment is almost not needed as snorkeling gets you to see most of the wrecks. Pohnpei reef walls is where the equipment is really needed. Freight is an important component of the milk run and perishables in that warm climate will take priority. Wanna go to Chuuk? You're still gonna take UA in all probability.

And there's no chance that there could be a travel problem through Tokyo or Manila? Written by a kettle. Kinda dumb allowing a 45 minute connection in Guam when they could have the milk run westbound. Less comfortable 1st seats, but they would have gotten there.