I live in Kosrae and right now I'm in Guam (transit) and head back home tomorrow on flt 957.

The flights are normally pretty full; however I know a lot of folks that can get the non rev seats. I would count on a few extra days however ahead of time just in case. Chuuk has other flights then just 957 / 956 island hopper flights however so you'll be fine, you can make it there within a few days max. Generally the 956/957 are weight restricted or full up especially between Kwaj / Maj, and Chuuk / GUM.

CO 1 is not that hard to find a non rev seat on, harder to do so on the island hopper as I said certain segments will be filled up and you'll get bumped. Many friends of mine have been bumped in certain areas for over a week before.

In Oct it will be easier on weight restrictions as they will drop their weight on luggage from 70 to 50 and majority, majority of islanders are not silver level or higher, and they are the ones that have full luggage (69.5 lbs each bag (yes I'm like that too, but x 3 !!!!!!!)) and multiple carry on's etc...

On a side note, Chuuk is not the best place in the world. You ever consider Palau instead or Yap? I came out here as an instructor many many years ago to Yap first then moved to Kosrae but have dove all over the Pacfic and Asia. Unless you're a deep diver and into wrecks then I'd suggest you look at Yap or Palau. Pohnpei isn't bad for diving either, reefs and such. Yap's Manta's are incredible, Palau has some nice diving, Kosrae is nice but slow paced and the most slowest or behind the times island. I'd love the divers coming to Kosrae but I still gotta say Yap has the best diving in the region, then Palau.

Just my two cents, enjoy your trip.