First off, this thread most likely belongs on the
Hawai'i board and would benefit from the expertise of our seasoned travelers to the islands there. Secondly, try the thread below as a starting point and do a search for answers to your questions. It has been addressed a couple times in the past.
http://www.flyertalk.com/forum/showthread.php?t=284629
FWIW, ATA also has a seasonal flight from SFO-LIH.
aloha