B.W.I.

Anyone who wants a glimpse of Amazon’s expansive appetite might pay a visit to B.W.I. airport, where a new white warehouse seems to stretch on and on.

On a private Facebook group for flex drivers working the Hanover, Md., station near B.W.I., the replacements for postal workers and FedEx truckers trade tips and grumble.

In 2016, Amazon Air, a new division, did not operate through B.W.I.

And in 2018, it loaded and unloaded 9,300 metric tons of goods at B.W.I., more than FedEx and U.P.S. combined, though globally their fleets remain far larger.

Until recently, the company’s B.W.I. expansion here was swathed in secrecy — environmental reports referred only to a “Midfield Cargo Operator,” and Maryland’s governor, Larry Hogan, spoke last year of welcoming to B.W.I. “a very well-known e-commerce giant.”