Colombia's President Juan Manuel Santos delivers a speech before his departure at the Jose Marti international airport in Havana, Cuba, Wednesday March 7, 2012. Santos said an invitation for Cuba to attend the upcoming Summit of the Americas is unlikely. (AP Photo/Franklin Reyes)

Colombia's President Juan Manuel Santos delivers a speech before his departure at the Jose Marti international airport in Havana, Cuba, Wednesday March 7, 2012. Santos said an invitation for Cuba to attend the upcoming Summit of the Americas is unlikely. (AP Photo/Franklin Reyes)