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Talks between General Motors Co. and electric-vehicle startup Rivian Automotive Inc. about the largest U.S. carmaker buying an equity stake have reached an impasse and may be dead, sources familiar with the matter said.

Should Amazon.com be considered one of the largest logistics companies in North America? The answer, according to most industry observers, is yes. And how big is that business? That question, unfortunately, can’t be answered definitively, at least not yet.

DALLAS — Aviation experts expressed doubt March 13 that turbulence could have caused the deadly February crash of an Atlas Air cargo plane carrying Amazon packages in Texas, suspecting human error or a massive malfunction as more likely culprits.

Amazon.com on March 9 hinted that fighting counterfeits was a reason for its sudden and unexplained purge of thousands of vendors that sowed panic among longtime suppliers.

Amazon.com abruptly stopped buying products over the past two weeks from many of its wholesale vendors, encouraging them to instead sell their products directly to consumers on Amazon’s marketplace.

Amazon Prime customers across the United States now can pick which day of the week they want to receive their packages. By offering the option of a specific day for delivery, the Seattle-based retail giant says this will cut its carbon footprint, reduce packaging since the items likely will arrive in fewer boxes, and make shipping more predictable.

A widebody cargo plane hauling packages for Amazon with three people aboard abruptly plunged out of the sky and slammed into a bay Feb. 23 as it was preparing to land in Houston.

Amazon.com Inc.’s role in the shuttering of New England Motor Freight and the “body blow” dealt to XPO Logistics Inc. is raising alarms for trucking and logistics firms that do business with, or compete against, the popular online retailer.

Amazon.com announced it will disclose its carbon footprint later this year, giving consumers and investors new insight into the environmental cost of its popular two-day shipping.