I see them in my area on flightradar24, running very consistent grids like this one: https://www.flightradar24.com/blog/wp-content/uploads/2015/05/Pattern-Cover

I see them in my area on flightradar24, running very consistent grids like this one: https://www.flightradar24.com/blog/wp-content/uploads/2015/05/Pattern-Cover-1170x429.jpg https://www.flightradar24.com/blog/wp-content/uploads/2015/0...