If you are flying AA to Hawaii--as I assume from your message. The quickest way would be to fly United and then walk from Terminal 8 down to AA, about 8-10 minutes. If you come in on America West or Southwest you woudl be in Terminal 1 and take the airport shuttle bus (a big A on it). Allow 5-10 minutes for the bus to come around and then another 5-8 for it to get to AA's terminal. Either way it is pretty quick and easy. My only suggestion would be to allow LOTS of connection time if taking America West as you can count on them being at least a half hour late (and I'm being nice here!)