Astronaut on board ISS captured the ship contrails near Aleutian Islands. The contrails are presumably the tracks of ships that connect Japan or China and Canada and/or the U.S.

Credit: NASA

Ship tracks are clouds that form around the exhaust released by ships into the still ocean air. Water molecules collect around the tiny particles (aerosols) from exhaust to form a cloud seed. More and more water accumulates on the seed until a visible cloud is formed. In the case of ship tracks, the cloud seeds are stretched over a long narrow path where the wind has blown the ship’s exhaust, so the resulting clouds resemble long strings over the ocean.

Reference: Ship Tracks, Aleutian Islands (NASA Earth Observatory)
See earthview photo gallery: LiVEARTH