NEW YORK (AP) — Amazon isn't content just being the "everything store." Increasingly, it looks like it wants to be its own deliveryman, too.

Its Monday announcement of a new air cargo hub in Kentucky is merely Amazon's latest foray into building out its own shipping and logistics unit. If successful, the move could ultimately mean lower costs for Amazon — and possibly faster delivery and low prices for consumers. But it could also pit Amazon against package deliverers like FedEx and UPS.

Amazon has long plowed its profits back into its business investments. In order to speed up its delivery, i...