HNL is the Honolulu airport code for booking. There ARE direct flights from SNA (Orange County) to HNL on Continental and sometimes Hawaiian Airlines. But you'll be cheaper to fly from LAX to HNL. If you're going to/from LAX (and from HNL to/from Aulani) and not planning on renting a car, look into a limo. The price is about $100 for each trip which beats lots of the van services if you have 3+ people.
Also, if you're not tied to VGC, you can often get really good hotel deals ($100/night) and direct flights from SFO (San Francisco) and SAN (San Diego) to HNL. You'll need to save your points for Aulani!
BTW, you're not thinking too far ahead, we're planning our big trip for right after the resort opens... that's why it's our home resort. I had been waiting for Aulani for about 3 years. A guide once asked me, "If you could vacation anywhere in the world, where would it be?" I answered, Hawaii. "Then," he said, "when we open a resort in Hawaii, you should by there." Thus, we bought on the spot in July.