any suggestions

[british connect]

hey guys im running an airline in [pw294] in the early 2000's and im planning big expansion. my question is im thinking of upgrading my fleet to all medium range planes, (with a speed of 450+ and a range of 4000+ with pax capacity of 130+) is this good or bad and if i did so what would the dop of each plane need to be and what planes would be best im based in europe and asia also planning to expand out to north america.
so in short:what planes would be best to run
and what dop would the aircraft have to make to overcome mx costs
where would the best place be to set up in north america
i was thinking in the middle so i can get to most airports without having to fly long distance to get to most of them

i hope this makes sense thanks in advance for your answers bc

[Cheung Airlines]

1.
so in short:what planes would be best to run
and what dop would the aircraft have to make to overcome mx costs
2.
where would the best place be to set up in north america

If u insists that the plane has to be over 4000nm, I'ld prefer Tu-204/214, but I think you wont need that range in NA
and I think ORD should be better than ATL at the first....
Fine, ORD and ATL are the best in NA

[british connect]

the range is not a mmust but i say 4000+ because i have pretty much used up the airports that are worth while between 0-3000 nm in europe and getting close to that in asia. and i want to reduce the amount of planes i am running by having faster ones.