I think there may be another thread where the importance of always keeping your final reserve intact was mentioned LB. However several posters still think it's OK to use it as a range extender instead. I am sure that when things went quite on this flight the crew and passengers may have regretted putting Expediancy and commercial pressure before safety. As a wise flying legend once told me, if there is any doubt about having enough fuel for the trip, there is no doubt .Stop enroute and get some more .it's not your fault the aeroplane hasn't got the legs for the trip. But it is your fault if you haven't got enough fuel on board when you arrive at your destination .