United just departed EWR Newark for Tel Aviv https://www.flightradar24.com/UAL84/42909d99

And several from IAD Dulles. https://www.flightradar24.com/UAL992/4290a5d2

All seem to be international though.

https://apnews.com/live/ground-stop-aviation-flights-news-up...

Flight radar is showing many flights that departed within the las hour. Maybe they are doing some controlled international departures since communication would be critical at arrivals (specially at busy hubs)

Edit: If you look now over the north atlantic you can only see outbound flights