Photo taken on May 24, 2013 shows people at the new terminal 4 at John F. Kennedy International Airport in New York, the United States. The new terminal 4 of the airport was opened Friday. (Xinhua/Wang Lei)

Passengers check in at the new terminal 4 at John F. Kennedy International Airport in New York, the United States, May 24, 2013. The new terminal 4 of the airport was opened Friday. (Xinhua/Wang Lei)

Delta Air Lines' CEO Richard Anderson (C) attends a news conference inside the new terminal 4 at John F. Kennedy International Airport in New York, the United States, May 24, 2013. The new terminal 4 of the airport was opened Friday. (Xinhua/Wang Lei)

Photo taken on May 24, 2013 shows people at the new terminal 4 at John F. Kennedy International Airport in New York, the United States. The new terminal 4 of the airport was opened Friday. (Xinhua/Wang Lei)

Delta Air Lines' CEO Richard Anderson speaks at a news conference inside the new terminal 4 at John F. Kennedy International Airport in New York, the United States, May 24, 2013. The new terminal 4 of the airport was opened Friday. (Xinhua/Wang Lei)