1080i is not a "16x9 format". All 1080i means is that you get 1080 lines interlaced over two fields per frame. It can be used for 16x9, and often is, and then you get 1920 pixels per line. But it also can, and is, used for 4x3, with 1440 pixels per line.
Right now, at least where I live, most...