The Hawaiian Airlines deal has a few benefits worth noting beyond the double miles:
- Hawaiian Airlines miles can be used for booking award flights on other airlines: Delta, Continental, Virgin Atlantic, and Korean Air
- Hawaiian Airlines miles can be transferred from person to person for free if you have a Hawaiian Airlines credit card. This can be a huge benefit if you have multiple family members or friends with small account balances. Combine them together for an award flight!
- Hawaiian Airlines miles can be transferred to Hilton points: two Hilton points per mile! So, since you get two miles per dollar from shopping at Amazon.com, you will essentially get 4 Hilton points per dollar if you choose to use your miles this way.
Hawaiian Airlines portal link: http://emarket.hawaiianair.com/mall/info/hawaiian/Amazon?afsrc=1&search_query=amazon
US Airways link: http://usairways.skymall.com/mall/info/usairways/Amazon?afsrc=1