Hawaiian Airlines offers several options for seat selection. Passengers can choose their seats during the booking process, at check-in, or up to 24 hours before departure through the Manage Flights section on the airline's website or mobile app. Hawaiian Airlines Seat Selection charges fees for seat selection in some cases. For example, passengers who want to select Extra Comfort seats will need to pay an additional fee. The fee varies depending on the length of the flight and the location of the seat. First Class passengers and Hawaiian Miles members with elite status can select seats for free. visit here : https://www.airlinesadviser.com/blog/can-you-choose-your-seat-on-hawaiian-airlines/