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I imagine Amazon builds their own fleet for much of the low-hanging (urban) fruit, while opting to use USPS for those hard-to-reach (rural) places. Once set up, it has to be cheaper for Amazon do it themselves in some cases. In others establishing the infrastructure is never going to be worth it.
I would also guess there would be some calculation for overflow/holiday/surge volume but no idea what that might entail.
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