I believe that some all-cargo airlines still fly the DC8. The DC8-62/63 series was re-engined some years ago (example UA
), upgraded to DC8-70 series with the new engines, and I think those are the ones flying the cargo routes now, even at that they may also have been phased out. They were a wonderful aircraft, about the same size as the Boeing 707, but the thing I like was the large windows. The window, at the bottom, was almost at a level with the armest on the seat. The only drawback to that was, I guess because it would weaken the frame to have more windows, the windows were fewer and farther apart, so a few rows would have no window at all, mostly in later years when airlines started putting in more seats.