US planemaker Boeing that holds billions in government contracts has sacked Cornerstone Government Affairs, the lobby which helped it navigate the aftermath of two 737 Max crashes in 2018 and 2019 that killed 346 people, reports Bloomberg.

Ziad "Z" Ojakli, Boeing's chief in-house lobbyist, ended the relationship because Cornerstone had taken on a client, Sierra Space Corp, that had hired Ojakli's predecessor at Boeing, Tim Keating, according to people familiar with the matter.

"Boeing has made significant changes across our leadership group since 2019, and our government operations team is no exception," said company spokesman Connor Greenwood.

"We've added new leaders with significant transportation and safety experience to the organization, and they are communicating transparently with government officials and policymakers every day," he said.