President Barack Obama climbs the stairs of Air Force One as he 

President Barack Obama climbs the stairs of Air Force One as he prepares to leave Mexico and travel to Costa Rica at the Benito Juarez International airport in Mexico City, Friday, May 3, 2013. Obama is to meet with Costa Rican President Laura Chinchilla before joining leaders from the Central American Integration system. The regional network also includes the leaders of Belize, El Salvador, Guatemala, Honduras, Nicaragua and Panama. (AP Photo/Eduardo Verdugo)
Associated Press
President Barack Obama climbs the stairs of Air Force One as he prepares to leave Mexico and travel to Costa Rica at the Benito Juarez International airport in Mexico City, Friday, May 3, 2013. Obama is to meet with Costa Rican President Laura Chinchilla before joining leaders from the Central American Integration system. The regional network also includes the leaders of Belize, El Salvador, Guatemala, Honduras, Nicaragua and Panama. (AP Photo/Eduardo Verdugo)
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