Senator Susan Collins, a Republican from Maine and chairman of the Senate Appropriations Subcommittee on Transportation, questions witnesses during a hearing in Washington, D.C., U.S., on Wednesday, July 31, 2019. U.S. aviation regulators, who have been stung by criticism for approving a flawed design on the Boeing Co. 737 Max that helped lead to two crashes, told lawmakers at the hearing that the scrutiny they're facing will improve safety. Photographer: Andrew Harrer/Bloomberg via Getty Images
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