orangemacaroni, all AA award tickets -- regardless of class -- can be changed as to date and time without charge, but only if award seats are available on the new date/time. In this respect, it makes no difference whether the award seat is booked in coach or in business.

If you are going to apply for an AA credit card, why wouldn't you apply for the one with the largest available bonus that you can achieve? With the 75,000-mile bonus, you will get the bonus if (and only if) you charge $1,500 to the card within the first six months. The 100,000-mile bonus offer has different rules, and ultimately requires you to charge $10,000 in the first year to get the full 100,000 miles. If you are going to apply for the 75,000-mile bonus card, you might as well apply for two of them -- Visa and Amex -- on the same day, assuming that you can charge a total of $3,000 within the first six months. Some are reporting only being approved for one; but there's at least one report on FT of being approved for both cards.

And keep in mind that on AA international awards, you are entitled to a free stopover -- of one day, one week, or longer -- at the North American gateway, which could be JFK, DFW, or MIA. If, on your return, you were to fly from EZE to JFK nonstop, and were willing to get yourself home by bus or train or one-way car rental, you could make JFK your stopover city, and then continue on, to another North American destination (like Hawaii or the Caribbean) from JFK weeks or months later, at no additional mileage. The only caveats are that all travel on each one-way award must be completed within one year of award ticket issuance, and you would, of course, have to arrange a way to get back from Hawaii or the Caribbean, or wherever else you chose to fly.