We require 24 hours notice in order to change or cancel your reservation. Tours cancelled with less than 24 hours affect other guests booked on the flight and don't allow enough time to resell the cancelled seats. Reservations cancelled within 24 hours will be assessed a 50% cancellation fee. No-shows will be assessed a 100% cancellation fee. If you need to change or cancel your reservation please provide us with 24 hours notice prior to your tour time and we will be happy to accommodate you. Air Ventures Hawaii reserves the right to cancel flights due to weather or operations. A 100% refund will be provided for cancellations initiated by Air Ventures Hawaii. Tours and times may vary due to weather conditions.