Boeing 737 MAX airplanes, along with one Boeing 787 at top, are parked at Grant County International Airport October 23, 2019 in Moses Lake, Washington. Boeing reported that its profits were down by more than half in the latest quarter.

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Boeing could disclose as early as Monday a decision on whether further cut or suspend production of the 737 Max amid continued uncertainty about the beleaguered plane’s return to service, The Wall Street Journal reported on Sunday, citing people familiar with the matter.

The company has repeatedly warned investors that it could cut output of the planes again or temporarily shut down its production line altogether if the flight ban drags on longer than it expected. Boeing CEO Dennis Muilenburg has said that suspending production could be “more efficient” than lowering output again.

Boeing cut 737 Max production in April by 20% from 52 aircraft a month to 42 a month in the wake of a second fatal crash of the 737 max within five months. Regulators around the world responded to those crashes by grounding the aircraft.

Boeing last week acknowledged that regulators aren’t likely to recertify the planes by the end of the year, as the Chicago-based manufacturer had previously forecast.

Boeing’s shifted outlook came after the Federal Aviation Administration publicly admonished Boeing over concerns that the company “continues to pursue a return-to-service schedule that is not realistic due to delays that have accumulated for a variety of reasons,” the agency said in an email to lawmakers on Thursday. “More concerning, the Administrator wants to directly address the perception that some of Boeing’s public statements have been designed to force FAA into taking quicker action.”

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FAA chief Steve Dickson told CNBC on Wednesday that the regulator likely wouldn’t clear the 737 Max’s return until some time in 2020.

The prolonged grounding has forced Boeing to consider scaling back a planned ramp-up in production next year, sources have told CNBC.

Boeing declined to comment on the timeline but said that it is working: “closely with the FAA and global regulators towards certification and the safe return to service of the Max. We will continue to assess production decisions based on the timing and conditions of return to service, which will be based on regulatory approvals and may vary by jurisdiction.”

The timeline for the 737 Max’s return has slipped repeatedly, creating uncertainty for airlines such as American, which last week pulled the planes out of its schedule until early April, meaning it expects the grounding to last more than a year. The plane’s grounding has cost the airlines, like American, Southwest and United, hundreds of millions of dollars in revenue.

— CNBC’s Leslie Josephs contributed to this report