I have a one-week rental in OGG (literally one week to the minute) using the Costco AWD but just realized the return is 4 hours before our departing flight. Not sure we want to get to the airport that early. I tried extending two hours (assuming we'd want to be there about 90 minutes later than scheduled) and the price jumps $400. I looked at Hertz (with the Platinum CDP) and it is the same price. Not being sure how long the weekly rate covers, am I better off just returning late or trying to extend when picking up?