How could this have anything to do with a mileage reward? The OP stated they received a 1099-INT, not a 1099-MISC or 1099-DIV. How could miles be recorded as interest income and not misc. or div. income?
That would seem to be an error...unless the OP has some special new citibank account that pays interest in AAdvantage miles??? Where can I get in on earning interest for my outstanding mileage balances?