In this March 13, 2019, file photo, people work in the flight deck of a Boeing 737 MAX 8 airplane being built for TUI Group parked next to another MAX 8 also designated for TUI at Boeing Co.'s Renton Assembly Plant in Renton, Wash. U.S. prosecutors are looking into the development of Boeing's 737 Max jets, a person briefed on the matter revealed Monday, the same day French aviation investigators concluded there were "clear similarities" in the crash of an Ethiopian Airlines Max 8 last week and a Lion Air jet in October. (AP Photo/Ted S. Warren, file)
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