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\"Ever since the Lion Air accident our top technical experts, engineers and test pilots have been working with regulators from all over the world on a software update that will make the 737 MAX airplanes one of the safest airplanes - ever - to fly,\" he noted.

He sidestepped a question, however, about mistakes made with respect to the maneuvering characteristics augmentation system (MCAS), an anti-stall system involved in both fatal crashes.

“There was no surprise or gap or unknown here or something that somehow slipped through the certification,” Muilenburg said.

He also mentioned that he has asked the board of directors to create a special committee to look at the way Boeing certifies aircraft internally.

ABC News’ Christine A.Theodorou and David Kerley contributed to this report.

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