engines been removed and singapore is where we now go to talk to do the financial correspondent linda holmes who's hopefully with us yes linda this is the economies of scale typically the way profit margins improve and in a three eighty was was built for that purpose really but it doesn't seem to have a lot. yes that straggler had you know of the. ring or jumbo jet were they to require more fuel in absolute terms than the smaller rival models and this would actually mean that every plane has to be full and all those for it to be able to meet its profit margins or even come up with a profit because every single ticket would actually create fears for the chief financial our operators because it means that that would actually mean that they have to pay for the fuel without an empty seat and this is one of the reason why the eighty eighty is not as attractive as the smaller boeing seven eight seven or even the. eight hundred fifty and of these twin engine jet and then boy enough to fly directly to where people want to smaller airports and eighty three eighty are so much bigger you need much bigg