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Amazon’s Echo device has reached a sales milestone, with a new report from Consumer Intelligence Research Partners estimating that the retail giant has sold 5.1 million of the smart speakers in the U.S. since it debuted?two years ago.

Amazon’s?patent,?approved last month,?could lead to the?development of noise-canceling headphones?that could?be overridden and muted by certain noises or keywords. This could mean the headphones are always listening for something that could indicate danger, like a car horn or emergency vehicle siren. It also means users could program in their own override words, phrases and sounds, such as the user’s name.

Amazon’s surprise announcement Thursday morning that it will begin searching for a second headquarters in North America will send political and civic leaders across the continent into a frenzied scramble to lure the fast-growing technology powerhouse.

Amazon’s expansion in Seattle was back in the news this week with the release of new plans for biospheres?at the base of one of the buildings in the proposed complex at the northern edge of downtown Seattle.?Jeff Bezos didn’t talk about the biospheres during Amazon’s annual meeting this morning — in fact, the drawings he showed didn’t include the spheres — but he did give perhaps his most extensive public comments yet on the company’s real estate plans.

Amid intensifying competition in the industry, the competitive situation among alliances has changed and airline companies have been seeking cross-alliance cooperation based on their own development, Qi said.