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At a hearing before DeFazio's committee, FAA Administrator Steve Dickson, a former US Air Force and commercial pilot, testified, "I'm not going to sign off on this plane until I fly it myself."

At almost the same moment in Mount Pleasant, Biden noted the attention he has been getting from Trump. Biden's appearances from earlier in the day were playing on TV screens when Air Force One landed in Iowa.

At least one analyst thinks Alexa is on the path to becoming Amazon’s next big driver. RBC Capital Markets analyst Mark Mahaney predicted a year ago that Alexa could be a billion business by 2021. Mahany expects the company to generate more than billion in revenue a piece from two different sources: device sales and voice-driven e-commerce sales.

At a media briefing last week, Wang Hesheng, vice-minister of the National Health and Family Planning Commission, the top health authority, said: "Beijing's medical reform is heading in the right direction, and has won support from a majority of patients. We will watch the reform and promote the experience in other parts of the country."

At least five tourists were killed and 63 injured when a 7.0-magnitude earthquake struck China's southwest Sichuan province at 9:19 pm on Tuesday.