She says "When such a ticket is purchased, we take that seat out of inventory. When it is released back into the inventory — often at the very last minute — we have lost our ability to sell it, and our fees offset some of the lost revenue.”

What about trying to get on an earlier flight from one neighbor island to another?  If there was space available on the earlier flight the inventory would not be lost.  Yet, they still charge us for the change on the earlier flight.  She is completely lost and out of touch with the locals.  The customer service staff were completely content in saying that they cannot change flights because it throws off the audits done by the mainland.  Such a lack of care and concern for the locals.