We do have days when we have a lot (and I mean A LOT) of packages left behind, especially if there is late air. I suppose they will have them do these packages on Saturday.I would think finding enough work to support more then a few T-S jobs would be the biggest problem. If a large Hub like yours only use a few drivers FT on Saturday what would the smaller hubs and centers do?
In addition, I heard that FedEx does ground on Saturday. With them and USPS delivering Saturday (even Sunday for USPS), UPS needs to remain competitive. I guess we can expect an even higher workflow once it goes public.