U.S. aviation officials have compiled data that statistically support, for the first time, Trump administration statements that the partial government shutdown hasn’t jeopardized air-traffic-control safety.

The data, according to one person briefed on the details, indicate that serious traffic-control deviations—incidents of planes coming dangerously close to each other in the air or on the ground—have remained flat from levels a year ago. Such incidents are typically captured by computers and other automated means.

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