Are you checking bags? You may be forced to clear immigration at EZE and pay (as Chepos mentioned the $140 arrival fee/px) then recheck at SA counter.
Don't you have an agency for the airline you can call to confirm about transit thru Brasil? We use CIBT and they answer all my q's when I have call them.
You pass bureau should have Timeatic (sp?) access for your carrier's requirements to board int he US for Brasil.
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