You can get 1000 HHilton points for 1000 Mypoints, so that would be 15000 HH points in total.
10k HH points gets you 2k AA miles for an overall conversion rate of 20%. You'd then be left with 5000 mypoints unused.
If you accumulate 50k HH points then you can get 12k AA miles for a slightly better conversion rate of 24%.
FewMiles..
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Unofficial Guide to AAdvantage:
http://home.webflyer.com/fewmiles/AA/