I don't know but did i just see an ufo ? do aircrafts fly just behind one another on exactly the same line, just a few kilometres apart ? just around 15 minutes back i was in my balcony watching the moon and the venus, then i saw an aircraft flying from west to east, perhaps it was a normal aircraft with two or three yellowish lights blinking but the strange thing was that just behind that aircraft in the same line, must be a few kilometres behind, in the exactly same line a single yes unlike normal aircrafts it was a single, bright red light was blinking and it seemed as if the red light was following the plane.