Federal Aviation Administration (FAA) chief Steve Dickson told a U.S. congressional panel that Boeing Co (BA.N) has "more work to do" as the planemaker continues to face scrutiny following two fatal 737 MAX crashes in the space of five months in 2018-2019 that killed 346 people.

  "Boeing is not the same as it was two years ago but they have more to work to do," Dickson told the Senate Commerce Committee on Wednesday. "We have reset the relationship with Boeing in no uncertain terms."