Go to AA.com and check out FAQ on award travel. Courtesy hold is indeed 5 days but change/cancel is vague. ( "Changing award reservations online is not an available feature at this time. Please contact AAdvantage Reservations at 1-800-882-8880 to make any changes to an award travel reservation. Any changes made to your reservation after ticketing may result in a charge." ) I just realized that you have 4 tickets so I guess the cost of flying to HNL from KOA may not be realistic.