I've been flying AA to and from EZE for 9 years, I've made around 50 round trips. I always buy coach and try to upgrade with VIPs or miles, my upgrade percentage is 80-90%. I prefer the 777s, they have 3 cabins and the business class seats are pretty good. AA started using the 2 class 767s recently, they are ok but not quite as comfortable. The food is the same in the 767s and 777s, its ok in business, edible in coach. If you like to drink they have 20 year old port in business, its yummy They fly triple 7s between JFK and EZE, I'd recommend it if you can get the cabin you want when you want to fly. Your second-best alternative would be to fly to MIA, then on to EZE.

I've never used awards for flying between the US and EZE, periodically I check availability but they are never available for when I need to fly. They tend to have some SAAver seats in business on weekdays, never on Mon, Fri, Sat, or Sun. The worst season for award flights to EZE is December - February, thats when many Argentinians go on vacation. The absolute worst time of the year is around Christmas.