Morgan Stanley estimates Amazon is delivering half of its US packages, will soon pass UPS and FedEx in total volume, at a current rate of 2.5B packages a year (Michael Sheetz/CNBC)

Michael Sheetz / CNBC:
Morgan Stanley estimates Amazon is delivering half of its US packages, will soon pass UPS and FedEx in total volume, at a current rate of 2.5B packages a year  —  - Amazon Logistics is the e-commerce giant's in-house logistics operation.  — “Our AlphaWise analysis shows …