Just to clarify, I'm not asking because of F/D1 service standards. I'm asking purely from a distance/descriptive point of view. For example, I wouldn't consider DCA-PHX to be a transcon, but I'd consider DCA-LAX to be one. ATL is a bit rough because it's on the east coast, but kind of a bit far inland from the ocean. CLT shares the same problem - is it a transcon hub or more of a longer midcon hub?

I personally consider all transcontinental cities to be BOS, JFK, LGA, EWR, PHL, DCA, IAD (although IAD is pushing it a bit as it's further inland), BWI, RDU, and MIA. The borderline cities, IMHO, would be CLT and ATL, and maybe IAD.

However, how do you define transcontinental? Purely coast to coast? As MD is east of VA where IAD is located... and SC is east of GA where ATL is located... would that still make them transcontinental?