I think we first have to decide where the purchase was made. To do this we need more info. Was the purchase made directly from the website of a U.S. airline or from a U.S. based wholesaler.....Orbitz, Travelocity, etc. Or was it purchased truly in Brazil from a ticket counter or travel agent? OP says it was purchased online. Was the price shown as U.S dollars or was in Brazilian real?
If it was U.S. dollars, the OP may have a tough case as U.S. tax was probably paid cuz the transaction was done via the U.S. If real was collected, then the OP should have an easy case. Just look at the receipt of purchase and that should really solve this issue.
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