Hawaiian looks like its just intra-Hawaii flights with CO:

http://www.continental.com/CMS/en-US...aspx?ItemId=72

UA is intra-Hawaii flights only when connecting to a mainland flight:

http://www.united.com/page/article/0,6722,52822,00.html


Island Air looks like miles flown on both CO and UA

http://www.continental.com/CMS/en-US...aspx?ItemId=73

http://www.united.com/page/article/0,6722,52288,00.html

I would suggest creating a OnePass account and combining status since you're on CO metal most of the time.