I checked the data on flightaware.com. There were flights departing JFK all night back to Europe. Some many hours late, like BA114 at 5am, and AF7 at 4am.

Personally, I'm surprised that CO threw in the towels for its international departures. I've seen them delayed till the morning hours for its European flights and still won't cancel. But they didn't get anything out after the Beijing and Tokyo flights yesterday.

Now, we'll see how long it'll take CO to recover. Jetblue basically canceled all flights Thursday night and yesterday, but they're now back up departing flights. CO was operating yesterday morning and tried not to cancel until late, but now is facing the consequence.

As for freezing rain and ice, I was once on an AC 340 at YYZ. The aircraft was covered in ice when we boarded. We went to de-ice, but when they finished de-icing the whole plane, we already timed out. So, we had to de-ice again. We were at the bay for over an hour.