Exactly one year after the Lion Air Boeing 737 Max 8 jet crash off Indonesia that killed 189, Boeing CEO Dennis Muilenberg appeared before U.S. Senators.

In the first of two days of testimony, Muilenberg began by apologizing to the victims’ families, several of whom were in the committee room.

He faced tough questioning about that crash and another involving the 737 Max jet in Ethiopia which killed 157, including 18 Canadians, as well as whether Boeing concealed information from regulators about a critical flight system.

That system has been implicated as a factor in both crashes and the 737 Max series has been grounded ever since.

”We have made mistakes, and we got some things wrong,” Muilenberg admitted.

He says Boeing’s in the final stages of updating flight software to improve safety.

Ahead of his testimony, Muilenberg refused to speculate on his future.

”My focus is on the job at hand,” he said.

”We’re focused on safety, and we’re going to do everything we can to ensure safe flights going forward.”

Boeing hopes to receive Federal Aviation Administration approval by year end so the 737 Max jet can resume flying.