Which isn't a particularly astute conclusion on their part, considering that that part of the country was once the actual capital of "the South," and it ain't the southcentral, nor southwest.....
I assume you are referring to the Confederacy. The capital of the Confederacy was Montgomery, AL and, later, Richmond, VA. Neither the District of Columbia or Maryland were even part of the Confederacy. So, no, that part of the country was not "once the actual capital of the South". I'm not even sure why you would want to use political boundaries, like the Confederacy, to determine geographical areas. However, seeing as there isn't a clear definition for the "Southeast", you are free to use whatever definition you prefer. If you want to use the Confederate boundaries to define what the "Southeast" is, that's your prerogative, but since neither D.C. or Maryland were a part of the Confederacy, that would contradict your earlier opinion that D.C. and Maryland should be part of the "Southeast".
Just because many other people, including the American Association of Geographers, disagree with YOUR opinion doesn't make them not astute. No offense to you, but I'd rather believe a well respected organization, like The American Association of Geographers. And given the 17 years that I spent in the NC, I can say a whole lot of people living in the Southeast would agree.
Which again, makes zilch sense, seeing as multiple Florida gateways handle plenty of domestic transfer all day every day.
Seeing as Florida is in every reasonable definition of the Southeast, I would agree with that. I only brought it up because you said this...
Charlotte/Concord/Gastonia isn't even in the top-5 metros for the Southeast.... nor is it second if discounting the Florida metros (which BTW makes no sense).
...which is not fact. Once again, if you left out D.C. and Maryland, and discounted Florida, Charlotte/Concord/Gastonia would be second.
Now, I'd love to see some actual numbers comparing domestic transfers of CLT, ATL, and those Florida gateways. My guess is CLT and ATL will be much higher.
Personally, I don't care what your definition of the "Southeast" is. You could include Idaho for all I care. The only reason I bring any of this up is because you bothered to correct enplaned
with information you presented as fact, when in fact, it is just your opinion based on subjective information.
I don't want to go too far off topic here, so I think I'll just leave it at that. I'll bow out of the topic.