I know. USPS has had contracts with both UPS and Fedex to deliver express/priority mail via their long-haul (airline) routes for years now. And even with this help they still can’t sustain themselves as they are currently operating.
Not that you'd like it, but their relationship to UPS and FedEx is simply one of "express, baggage and freight". And it doesn't have to be as good as it is now.
SURFACE WORKS WELL in America ~ it's just not fast.