NW won't want the RR
I dunno about the 753 replacing all the high density.
ATA's 753s are ETOPS, but that doesn't mean CO
will maintain the certification.
Swapping the 753 onto Hawaii would be fine to replace any 762s in the market, but the 764s on Hawaii duty have a lot of seats. The 753 isn't quite enough, especially since CO
offers BizFirst on Hawaii routes.
3270 is the still air distance, but the plane will struggle to do nonstops westbound from Europe without restrictions.
All in all, I think this is great. The 753 is a money machine.