Perhaps it would be poss to do this if you could find some 2nd hand A320s and A330s, instead of using 737s?
A320s would do short-haul, A330s would do long- haul
. You'd get all the benefits of fleet commonality, same pilots could be trained to fly both a/c etc etc...
But I suppose it depends if people can put up with cramped conditions for 6 hrs.....
