This is mainly to any Delta pilots who fly the CLT to ATL route. I've noticed on my many trips through ATL that we seem to follow one of two main routings.
KCLT HOR1.HARAY SPA.MACEY2 KATL - which brings you into ATL from the north to land on rwy 8L/26R
KCLT PAN6.ANDYS IRQ SINCA.SINCA3 KATL - which brings you into ATL from the south to land on rwy 9R/27L
Is there usually a deciding factor for which route will be used. Is there some rhyme or reason? For example, if a flight was be arriving at a gate on the North side of the terminal would it use the north approach into ATL and for arriving at a gate on the South side of the terminal would it use the south approach into ATL?
There is usually a small time difference as well, the southern route is just a bit longer. I've always wondered about this but never got around to asking.
Any insight would be appreciated. Thanks