MANFOD
Airlines to New York surely gear their flights to the required demand and yield.
For example at BHX the EWR 757 is 93% full between late spring, summer, autumn. Yet they have cut 2 days out this year in Feb,and retained 6 days only in March, presumably for low yield.
Therefore the issue with EK possibly doing a through flight to New York from BHX probably wouldn't work in those winter months.
Therefore its ok for MAN to say New York is under served,yet surely US airlines would put a larger plane on the route if the demand/yield justified it. As it stands one can assume that their larger planes are on more profitable routes ?
Nigel