You'd be amazed (terrified?) to hear of the number of "proud" Captains who carry bare minimum fuel all the time in an outfit I'm familiar with, but could'nt possibly name. be my guest, stupidos!
I was once criticised on a line check for taking 45 mins extra holding fuel on a UK internal flight. CB activity was forecast for the entire destination and diversion area.
OK, I realise that on long flights, the MTOW may restrict extra fuel. I'm not 757 familiar. Anyone know if this was likely in the accident case?