Thanks haejangkuk for posting. It,s about time these fatigue issues will be known,and discussed openly. Public will inevitably add some salt,but it is their right,and praps even duty to demand answers. Any pilot flying max legal hours from year to year ,knows that She/He will probably never reach retirement by age. Costs of loosing invaluable experience with someone who was trained for long career,are inaccountable. So who cares,because there are no numbers to play around with?