The chairman of the U.S. House Transportation and Infrastructure Committee and the head of its aviation subcommittee said on Monday that Boeing¡¯s testimony on two fatal 737 MAX crashes prompted new questions.

Reps. Peter DeFazio and Rick Larsen said in a joint letter to lawmakers that Boeing Co. Chief Executive Dennis Muilenburg¡¯s answers at the Oct. 30 hearing ¡°were consistent with a culture of concealment and opaqueness and reflected the immense pressure exerted on Boeing employees during the development and production of the 737 MAX.¡±

The pair added that the hearing did not end the committee¡¯s investigation and that Muilenburg and Boeing Commercial Airplanes Chief Engineer John Hamilton¡¯s testimony prompted ¡°a litany of new questions for both Boeing and the FAA about the failures that led to the tragic and unnecessary deaths of 346 innocent people.¡±

Boeing did not immediately comment.