I dont' know the precise rules, but I know that I've never gotten more than 500 base miles between Lihue and Kona. However we don't exactly pay for each segment, so in some way it makes sense. As cblaisd points out, we would buy the two segments separately, but that would be twice the price. However if you could get two of the restricted and promotional $38.50 tickets, that might just work fine both pricewise and mileagewise.