Regarding CLT, I’m not a huge fan of the new giant runway to the west of the current center runway idea. Stretch the existing center runway, then drop in a 7,000 ft piece of pavement between the GA complex and Billy Graham. Put all the RJ traffic on that and you’ve massively simplified the operation.
We could immediately score some easy gains in taxi congestion if we had some 18L/36R specific transitions for all the RNAV arrivals. As it is most of the E Concourse traffic lands on the west runway and has to make the great migration to the NE corner of the airport, and each one of those aircraft takes up as much space as a 319/320/321 when it comes to taxiing.