Scubabride--don't forget:
Matrix - ITA Software
for revenue tickets. LCC's you'll prob have to find on your own. Jetstar, Tiger, all sorts of those in Asia--watch those extra fees and regs for carry-on sizes.
I almost always see better numbers JFK/NRT (and sometimes DTW). ATL is the worst. MSP is very popular lately. LAX is good/bad any given day. SFO is also fickle. SEA is pretty reliable for coach (UGH) I've seen seats sell out in a day. No shows are rare in BE.
Don't forget Haneda and transfer to NRT as last resort. Then you can freak out getting to MNL. (PS--I got my vanilla beans in Bali--70 long ones for $15!!)