Duffy traveled to Washington and met with Boeing CEO Kelly Ortberg, along with acting FAA Administrator Chris Rocheleau, following last year's mid-air panel blowout on a new Alaska Airlines 737 MAX 9 airplane that was missing four key bolts.
Ortberg will testify April 2 before Congress.
"They've lost trust," Duffy said. "They have to take a look at how they're manufacturing. They have to look at their quality. They have to get it up to a place where the FAA and the American people and the airlines feel like they're producing incredibly safe airplanes."
Duffy noted that Boeing has new leadership.