It seems both American and Delta are adding NYC-EZE flights.

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American Airlines, Delta to add flights from New York to Buenos Aires

Wednesday, June 18, 2008
American Airlines Inc. and Delta Air Lines Inc. have won government approval to add flights from New York to Buenos Aires, Argentina.

The U.S. Department of Transportation OK'd Delta’s application to launch service between New York’s John F. Kennedy International Airport to Buenos Aires with five flights a week during the peak December-April season and four flights a week in other months.

American was granted the right to add five flights a week to the single daily flight it now operates between the two cities.

http://www.dallasnews.com/sharedcont....16f60f71.html