Once you get a HA credit card, you get 5000 miles for joining $50 annual fee,
4 drinks and 2 headsets plus I got a 50% off coupon for full fare
You also get the ability to accept HA mile transfer from others for free and various offers.
When you log in at
www.hawaiianair.com there are often deals for HA cc holders such as the $499 OW or $899 plus fees F tickets. These deals are only about 90 days in advance for some but others last 6 months at a time.