I would imagine that the upturn of the Asian economy has something to do w/ the Hawaiian economy picking up. The economic boom here in the US also means that Hawaii is within the budget for a lot more people, and the luxury resorts seem to be doing quite well too.
It seems like a lot of the seats are going towards OGG these days. New flights from a number of airlines, including AA out of SJC and DFW, TW out of STL and UA going to 777s out of SFO.