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"and then using AA from HNL to Barcelona taking advantage of their 12 month layover"
You don't get a 12-month stopover at the North American gateway on AA international awards. All travel (including post-stopover travel) must be completed within one year of award-ticket issuance, not within one year of the first flight on the award. So if you want to fly to BCN in April, 2013, you would have to wait until the Spring of 2012 before trying to book the HNL-NYC-BCN award.