When I woke up again in the morning, at around 0400, its speed was about the same but at 4,000 feet higher. As far as I was awake, the fastest speed was 933km/hr. At 0435, the aircraft was traveling just to the north-west of Okinawa on the East China Sea, but still about 1200km away from KIX. Outside temperature at 33,000 ft – amazingly minus 35 degree Celsius!