The majority of countries (aviation authorities) not only allow ALL required flight crew members of a flight to log all hours (including bunk), they infact demand that they do. As mentioned above, they are still on duty and can be called to action at any time, are still compensated as such, and are not free to do as they wish, on rest or at the controls, until the flight lands. There are very few countries that follow the HKCAD in this regard. Dubai and the UK come time mind, and that is literally it...