Originally Posted by
3Cforme
I get the impression that routing rules are updated infrequently. There's probably lots of xxx-CVG-YYY or XXX-MEM-YYY that has been gone for years.
Adding data point. Delta updated the routing rules for LGA-CHO on 11/26/18 (Comparing full fare basis Y using ticketing date in expert flyer, it wasn't just a discount fare change)
Before: NYC-RDU/NYC/DTT/CVG/BOS/ATL-CHO
After: NYC-RDU/NYC/DTT/CVG/BOS-CHO
Only service into CHO is from LGA and ATL, so deleting ATL had the effect of requiring non-stop routing. But if Delta is going through the step of changing routing rules, I wonder why they leave RDU/DTT/CVG/BOS in there?