Hawaiian Airlines allows passengers to upgrade their seats to a premium cabin. However, to avail of this service travelers need to comply with Hawaiian Airlines upgrades policy which states that the upgrade is subject to the availability of seats, once the offer is accepted then no refund, credit, or change is made. Further, if the upgraded flight is canceled by the airline, in that case, the amount is refunded. For more information on guidelines, benefits, and modes to upgrade visit the official website of Hawaiin Airlines or follow the link to the blog.