As an non UPS pilot, I'd have to ask a couple of questions.
Since the military splits up their business, is UPS flying their full allotment of flying on other planes? If so, then UPS can't just go out and fly more. It doesn't work that way. The cargo business is further split between contoured and non contoured (IE: B 747 and AN 124). So you'd have to look at that too. I know that UPS is on the FedEX team and you'd have to look at the split of business within your team too. An example is that World flies the contoured cargo within the Alliance team using our MD-11's. Since we got B 747's, we can only fly the non contoured cargo that our teams primary member (Evergreen) can't handle.