Like Starbucks baristas before them, airline workers are going back to school...or at least mandatory training sessions. JFK airport is gearing up for a busy summer of travel, and they're preparing to meet delays and frustrated airline passengers head-on, and with a happy face. At least 500 employees are getting "nice" training; from the AirTran to the parking lot to the ticket booth, travelers should be greeted with a smile -- albeit a forced one.......