My point was that despite the size of aircraft shrinking, bmi as a company are also still shrinking! They'll soon disappear up their own a**e!
The question was that why can the likes of Easy expand and get larger aircraft? I fully understand the yield thing but with the theories provided above we should all be operating Senecas! Why choose and operate routes with low passenger numbers when there are routes out there that warrant bigger aircraft with at least equivalent yields?
As for the BA 757's, the routes they operate don't really warrant that size aircraft with its operating costs (Far higher than a 320/1) while not really carrying many more passengers than a 320/1 BA also have the luxury of being able to use any of its types on a route if it outgrows the current one. bmi don't, or won't have!
Come on Sir Richard, get that cheque book out!!!