<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by JenniferNAz:
From my understanding, I can buy a coach ticket, and use WP miles to upgrade (17,500 miles OW), any fare with the exception of T & K. Do I understand this correctly?</font>
Yes. Rules for Hawai'i upgrades can be found:
http://www.nwa.com/freqfly/direct/charts/zone03.shtml
Seats are limited and you can use ITN to see if there are any F seats to upgrade into.
<font face="Verdana, Arial, Helvetica, sans-serif" size="2">My other question is about upgrade certificates. Are there certificates that can upgrade from coach to first to Hawaii? Is there a place where these are listed, or any suggestions to find out about the rules of a certificate without having one?</font>
Unless you're a Plat elite with a lot of Plat points in this upcoming year or a Hawai'i resident with a valid Hawai'i Driver's License and home address, you're SOL on the upgrade certificates.
FWIW, these questions have been answered numerous times... perhaps try searching HNL Upgrade or HNL first next time.
aloha