There was a formation of 3 flying single file south along the Hudson River at ~1,800 ft at 1:10pm today. I first noticed it just north of the WTC and lost it behind some buildings about 2 miles south of the Statue of Liberty. They might have turned at this point. They were pretty slow so I assume they were helis, I was like 8 miles away so I couldn't really tell any more than that. Any idea what this was?