There was a time when CO had first class, though I recall it looking similar to what we call business class today. I flew IAH-LGW in first class as a kid in 1986 (recompense for an MX cancellation causing us to lose a day of a family European trip). I have a few memories of the trip, mostly the big, reclining chair, the amenity kit/eye mask, and the pre-flight drink (simply OJ for me, but I had never been offered anything on the ground before).