Trying to get best bang for a # of diff points and plans. AMEX Business Plat member w/ 3M miles and access to 35% rebate w/ AA on bookings through AMEX travel. AA Executive Plat member with 300K miles and 400K Chase Sapphire points. Looking to travel from east coast to HI (GSO to LIH). Prefer AA as I have opportunity to be upgraded, but flexible. TPG and Expert Flyer are helpful but feel like I am missing something. What other sites are recommended? To confirm even though AA may offer a codeshare flight segment on UA I cannot use AA points to pay for? Any advice appreciated.