As mentioned on AA Web page there is a great offer to earn bonus miles Between New York And Costa Rica. Earn AAdvantage® bonus miles for round-trip travel between New York/JFK and San Jose, Costa Rica, simply by registering on AA web page and traveling between April 6, 2010, and June 30, 2010.
Beginning April 6, American Airlines will offer new daily nonstop service from New York (JFK) to San Jose, Costa Rica (SJO). For a limited time, you can earn up to 5,000 AAdvantage bonus miles for each round-trip you fly on our new route. Just register prior to travel and fly between April 6, 2010 and June 30, 2010. Business Class Fares 5,000 bonus miles and Economy Class Fares 2,500 bonus miles.
This flight gives travelers new options to fly into Costa Rica.