Aaron Katersky reports as officials in New York remain on high alert, monitoring the New Year's Eve celebrations in Times Square with drones, K-9 units and thousands of officers; Victor Oquendo has the latest on the crippling blackout in Puerto Rico that has left more than one million customers without power; Britt Clennett reports from South Korea where an eight-person team from the U.S., including members of the NTSB, FAA and Boeing, have joined South Korean investigators to search for the cause of the deadly Jeju Air jet crash; Mary Bruce shares the New Year's Eve celebrations and spectacular displays from around the globe; and more on tonight's broadcast of World News Tonight.