As for the UPS XML Plugin, I have set the Shipping Delay to 0.34 days so that if a customer orders after approximately 11:45AM eastern time, the system will calculate the ETAs based on the shipment going out the following day. All worked well, as orders placed before 11:45 had an ETA that was one day sooner. This was tested on a Tuesday and a Wednesday.

Then, I tested the plugin on Friday at 11AM eastern time and correctly received an ETA of Monday for Next Day Air delivery, since there was plenty of time to schedule a UPS pickup for the package. Expecting the shipping delay to have kicked in, I checked again on Friday after 8PM (which is too late to send a shipment}, but still got the ETA of Monday. I checked again on Saturday at 6AM, and still got the Monday ETA. So, it seems that the UPS API is set to assume that shipments go out on Saturday. I have emailed UPS to confirm this, but have not yet received a reply. (I did not see a problem with the ETAs of orders placed on a Sunday.)

My question is: is there a flag that can be set in the interface with the UPS API that turns off Saturday shipping? I have looked for UPS'es Time-In-Transit API technical documentation, but have not found it as yet.

Please Advise,
mrsawyer