When the big guy pulls out...the ink was barely dry on American Airlines' memo that it will be cutting back its San Juan, Puerto Rico, flights dramatically when comes this word that JetBlue will be increasing its service to the Island. For instance, it will offer seven daily flights from New York JFK by December; that's up from three now, and the frequencies will grow gradually. And it's along with daily flight to Aguadilla and Ponce, two of the Island's smaller destinations. From Orlando, JetBlue will offer four daily flights, double its current schedule, as well as flights to the other two cities. Orlando, interestingly, is the single largest source of US visitors to the Island.