As we've been reporting recently, the airlines are increasingly holding back their best deals for their own websites, putting the big online travel agencies like Travelocity and Orbitz at a competitive disadvantage.  American in particular has been very aggressive about promoting sales exclusively via their website. 

The latest deal to hit the Internet is 15% off all flights from the continental US to Hawaii when booked via the AA website using the promo code DFALOHAGO.  This offer is valid for travel between December 6, 2007 and March 6, 2008 with blackout dates December 20-23 & 26-30.  You must book your reservation by December 7, 2007.

It is also important to note that that base fare must be at least $400 to be eligible for the discount.