Last night, all jetblue and american flights were closed. The airport basically shut down except for Delta. DL at JFK had only 2 intl departures. This airport is a humungous mess now. Our flight to Nice was cancelled 3 hours later than sched. There is 6 inches of ICE. We went to the Delta Crown Club Room where they gladly early rebooked us. So from the crown room right now i see at the minimum 15 ice covered DL 767s.