The HA Website
 

Is there anyway to purchase specific HA interisland fare classes without talking to a human being? The website gives you the cheapest available fare class, and you can choose first class, but I haven't figured out how to buy full Y, let alone a mid-range fare that will earn NW miles.

Nice to see all those $20.06 fares loaded, at least....

Nope. You have to call.

And while we are on the topic, one more question... what fare classes do the columns correspond to?

There are six under Y, and one under F.

I assume the far right Y column is full fare, and the far left Y column is heavly discounted internet fares, but do the others follow a regular pattern or match to a particular letter class?

Oh, the humanity. Thanks cblaisd.

The cheapest fare class that both HA and NW think will earn NW miles (i.e. neither of them says it won't is either $49 or $59; I don't recall which. It's not uncommon for them to run out of seats in that class, in my experience.