I've been to a few hubs for various assignments. Louisville is of course the largest air hub and CACH is the largest ground hub.
CACH has some very impressive stats:
120 unload doors
1100 load doors (one for every preload in the US I've heard)
10 bullfrogs (for smalls)
I've been to the Jax hub, Pdale hub, and Hialeah hub. Every hub I have been to has a mezzanine level.
Jax: supposed to be the largest ground hub behind CACH and has broken many volume records during peak. 4 sorts per day, each around 200k or more in volume. During peak the 4 sorts combined broke the 1 million mark for volume processed in a 24 hour period. I think there is somewhere around 15 outbound pd's in Jax. Not sure how many total doors there are.
Pdale: not as big as Jax but still 4 sorts a day around 150k per sort. 40 unload doors and around 160 load doors. About 14 outbound pd's.
Hialeah: under-utilized hub. 3 sorts a day, each under 100k in volume. 40 unload doors (not all are used) and 100 load doors. About 11 outbound pd's.
This could be a stupid question...but how can hialeah (i have no idea what hub that is to be honest) have 100 load doors and its 11 PDs and we have only 7 PDs and we got 85?
Like I said, Hialeah (hub for South Florida district) is under-utilized. There are lots of PD's (11) with few doors per PD (approx 9). Some of the sorts use more PD's than others and some PD's are not used at all. Your hub's 7 PD's spread amongst 85 doors is about 12 doors per PD. Do the PD's use every single door?
Another interesting note, some hubs were pre-designed to allow expansion up to 16 PD's (Hialeah was one of them but that will never happen). You can see this in the area around the sort aisles. There is hardware in place that looks like conveyors but they go nowhere and there is no conveyor belt on them.
Regarding Hialeah, it was build in 1986 and sits right next to ABC Distributors. At that time ABC Distributors was a huge multi-million dollar account that added 10k - 20k of volume daily to the Hialeah hub. A few years ago, the account was lost and Hialeah became the under-utilized hub that it is today.
in Island City (Queens, NYC), we have 32 unload bays, and 10 PD's (not sure how many outbound bays, approximately 150-160), plus the air sort finger with like 20 bays because we process air for JFK airport. non-peak volume ranges anyhwere between 60-90k on the night sort, not sure about the twi.
We are small. Only a few doors that are used for unloading (preload) and then the same exact doors are used for loading (reload). We have between 25-34 drivers out on any given day. Small centers are cool because the part-timer/full-timer ratio isn't as broad as it is in most hubs. That means the wait time to become full-time is much shorter.
not the same where i am. avg 7-9 years to go full time. 34-37 routes any given day. good thing is that i am really good freinds with and know everyone i work with.