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Here's where you prove your ignorance. The average Express courier has several different delivery commitments, which means no straightlining unless there is a National Service Disruption. Pickups is where it gets fun. Let's say I have a pickup area with multiple cutoffs, which vary from 1500 to 1600, but can vary more or less depending on the route, especially if it is extended area. So, in addition to my 10-15 regulars (house stops in UPS speak) I have 20 or more on-calls, which means that customers can call right up to the cutoff time and get a pickup the same day. This means that I have to get really creative to make it all work correctly. They can and often do call at 1459 or 1559 to buy themselves more time, or they call and want an early pickup or specific pickup time. Guess what? They will be told whatever they want to hear and we're supposed to "make it happen". I need to be able to work-in these pickups while I'm still trying to deliver all my SO before 1500 and P2 before 1700. It isn't rocket science, but it isn't easy either. Frankly, it's well beyond your average employee bbsam...I can assure you of that. Oh, and somewhere in there I need to get a full hour lunch, even when there is late freight.
This is where Ground folks don't "get it", and where Ground will fail miserably if and when they get real on-calls and real pickup routes. It's amazing how stupid some of these ISPs are when it comes to the differences between the opcos.
I assure you MFE, if you can do it, I can train my box monkeys to do it.