I have a GPU on an Island Hopper (HNL-MAJ-KWA-KSA-PNI-TKK-GUM) flying next week (Friday April 3rd) and it still hasn't cleared. It's an H Fare..

I see that there is J on all flights except for TKK-GUM

Will I clear each flight individually at the gate? Or because it's booked as a through flight, if there's no space on all the flights, Will I not get an upgrade at all?

Can I ask the agent to split it up the segments?