The final flights will do their thing on March 31, but if you have tickets for flights after that you’re going to need to file to get your money back. Refunds are available on the web, and you will need to fill out a form and wait around three weeks for things to be processed. If your flight is on or before June 30th, go! may transfer your ticket over to Hawaiian Airlines.
As for the future of interisland airfare, Hawaiian Airlines will certainly be leading the way for the immediate future. Sure, Island Air and Mokulele Airlines still fly as well, but no one can compare to the fleet and frequency of Hawaiian Airlines. We just hope this doesn’t send interisland airfare too high into the sky.