Think it stemmed from this:
Overseas flights surge in Charlotte; take off for Rome tonight? - CharlotteObserver.com
No emphasis re Manchester, but interesting stats re USA hubs, in that
"The US Airways hub in Charlotte is now the nation's fourth-largest,.... The largest hub is Delta's in Atlanta, with 811,000 weekly seats; American's hub at Dallas-Fort Worth follows with 576,000 weekly seats.
US Airways in Charlotte had 388,000 weekly seats in April, slightly less than United at Chicago, with 392,000. The US Airways hub in Philadelphia had 266,000 seats.
So, in regards to Manchester - USA hubs we have 2 yet to be covered.
Atlanta: Got that
Dallas: Needs service. AA?
Chicago: Yep, got that covered
Charlotte: Never thought of that 1
Philly: Covered