I think it comes down to where your base is. You have to consider how many places are with in the 767-400 range. This plane does really well, the furl burn is low and has very good capacity. If most of your long haul routes are within its range, eg europe to us- europe to asia, well go this one over the rest. However, the 767-300 doesn't do aswell.They still make money but over about 5800m it gets thinner the further you go. There for if many routes are more that the 767-400, go the busses or 777's.