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A Boeing 737 Max aircraft sits on the tarmac at Boeing's production facility in Renton, Wash., on Dec. 16, 2019.Lindsey Wasson/Reuters

Boeing Co. has fired chief executive Dennis Muilenburg after a year of intense scrutiny and industrial setbacks set off by twin fatal crashes of its 737 Max jetliner.

Here is a timeline of events:

OCT. 29, 2018 - A Lion Air 737 Max plane crashes in Indonesia, killing all 189 people on board.

NOV. 13, 2018 - FAA, Boeing say they are evaluating the need for software or design changes to 737 Max jets after the Lion Air crash.

NOV. 30, 2018 - Boeing is weighing plans to launch a software upgrade for its 737 Max in six to eight weeks that would help address a scenario faced by crew of Indonesia’s Lion Air, sources told Reuters.

MARCH 10, 2019 - An Ethiopian Airlines 737 Max crashes, killing all 157 people on board.

MARCH 12, 2019 - FAA says it will mandate that Boeing implement design changes on the 737 Max by April that have been in the works for months.

MARCH 13, 2019 - FAA joins other major global regulators in grounding the 737 Max, citing evidence of similarities between the two fatal crashes.

APRIL 6, 2019 - Boeing says it will cut monthly 737 Max production by nearly 20 per cent; U.S. and airline officials say they believe the plane could be grounded for at least two months.

MAY 16, 2019 - Boeing says it has completed a software update for its 737 Max jets and is in the process of submitting a pilot-training plan to the FAA.

JUNE 27, 2019 - Boeing says it will take until at least September to fix a newly identified problem with software that emerged when FAA test pilots were reviewing potential failure scenarios of the flight-control computer in a 737 Max simulator.

JULY 18, 2019 - Boeing says it has assumed regulatory approval of the 737 Max’s return to service in the United States and other jurisdictions will begin early in the fourth quarter.

OCT. 24, 2019 - Boeing says it still expects FAA approval to fly the 737 Max in the fourth quarter, sending its shares higher despite a slump in quarterly profit. FAA says it will need “several weeks” for review.

NOV. 7, 2019 - U.S. and European regulators ask Boeing to revise documentation on its proposed 737 Max software fix.

NOV. 11, 2019 - Boeing says it expects the FAA to issue an order approving the plane’s return to flight in December, forecasting commercial flights to resume in January.

NOV. 15, 2019 - The head of the FAA tells his team to “take whatever time is needed” in their review of the 737 Max.

DEC. 11, 2019 - FAA chief Steve Dickson says 737 Max will not be cleared to fly before the end of 2019.

DEC. 12, 2019 - Boeing abandons its goal of winning regulatory approval for the 737 Max to resume flying in December after the U.S. Federal Aviation Administration (FAA) said the plane would not be cleared to fly before 2020.

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