Update (0915ET) : Boeing shares have reopened - 3% higher...

So why is the stock rallying? Is Calhoun suddenly going to solve this? It appears America isn't buying it...

Would you fly the Boeing 737 MAX just because CEO Muilenburg quit? — zerohedge (@zerohedge) December 23, 2019

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In what was not entirely surprising, Boeing CEO Dennis Muilenburg has "resigned" and will be replaced by current Chairman David Calhoun.

CNBC's Phill LeBeau has a slightly different take:

"This was the decision of the board. .. He was fired."

Boeing shares are currently halted...

Over the 3-year period 2016 through 2018 - Muilenburg's reign as CEO - Boeing employees received newly issued stock that’s worth $4.9 billion today. There was another $3.5 billion worth of stock issued to the Boeing pension plan, which was immediately sold into the open market.

h/t @fxmacro

And Muilenburg added a massive amount of debt to Boeing's balance sheet...

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Boeing announced today that its Board of Directors has named current Chairman, David L. Calhoun, as Chief Executive Officer and President, effective January 13, 2020. Mr. Calhoun will remain a member of the Board. In addition, Board member Lawrence W. Kellner will become non-executive Chairman of the Board effective immediately.

The Company also announced that Dennis A. Muilenburg has resigned from his positions as Chief Executive Officer and Board director effective immediately. Boeing Chief Financial Officer Greg Smith will serve as interim CEO during the brief transition period, while Mr. Calhoun exits his non-Boeing commitments.

The Board of Directors decided that a change in leadership was necessary to restore confidence in the Company moving forward as it works to repair relationships with regulators, customers, and all other stakeholders.

Under the Company's new leadership, Boeing will operate with a renewed commitment to full transparency, including effective and proactive communication with the FAA, other global regulators and its customers.

"On behalf of the entire Board of Directors, I am pleased that Dave has agreed to lead Boeing at this critical juncture," Mr. Kellner said. He added, "Dave has deep industry experience and a proven track record of strong leadership, and he recognizes the challenges we must confront. The Board and I look forward to working with him and the rest of the Boeing team to ensure that today marks a new way forward for our company."

Mr. Calhoun said, "I strongly believe in the future of Boeing and the 737 MAX. I am honored to lead this great company and the 150,000 dedicated employees who are working hard to create the future of aviation."

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Notably, no well wishes for Muilenburg on the way out.