Thank you for the answers, it now gives me somthing to delv into, to try and expand my further understanding,
Re "Dangerous Flights".. I think the title is to attract an audience to that show, but its mainly based on a couple of US pilots who seem very well versed on all aspects of commercial flying, transporting by flying any type of Aircraft to anywhere in the world, as far as I have seen its really only the marginal fuel left after such flights that seems to be the Risk they are prepared/happy to take, plus the fact that it is highly over dramitised for the TV film.
Peter R-B