Boeing plans to make major changes to the flight control systems on the 737 MAX aircraft — just months after delaying a similar software fix due to failed negotiations with the FAA, a report says.

Sources briefed on the talks told The Wall Street Journal that federal regulators determined that the delay was acceptable because its experts believed there was no imminent safety threat, as did Boeing’s.

The updates — which involve multiple sensors, or data feeds, being rolled out into the MAX’s stall-prevention system in place of its current single-sensor setup — were ordered up in the wake of the deadly Lion Air crash in Indonesia last October and were originally planned for early January.

“For the past several months … Boeing has been developing a flight control software enhancement for the 737 MAX, designed to make an already safe aircraft even safer,” the plane maker said in a statement late Monday. “This includes updates to the Maneuvering Characteristics Augmentation System (MCAS) flight control law, pilot displays, operation manuals and crew training.”

Sunday’s Ethiopia crash marks the second time in less than six months that a 737 MAX aircraft has gone down.

Differences of opinion about technical and engineering issues ultimately led to Boeing’s software change delays, according to the WSJ.

Officials at the company reportedly didn’t agree with federal regulators on how extensive the updates should be. The company, at one point, complained about using multiple sensors to run the MCAS flight-control system — saying it would be more complicated, the WSJ reports, citing industry insiders.

Boeing reportedly claimed the single-sensor system was reliable and had a good track record on other plane models. The FAA also determined that steps taken after the Lion Air crash — which included educating pilots on how the system operates — were enough to “alleviate hazards,” according to the WSJ.

Boeing wouldn’t comment Tuesday on the delayed FAA discussions, but the company did confirm the upcoming changes to its MAX aircraft. They are expected to come sometime in April.

According to the WSJ, US officials have also blamed part of the delay on this year’s government shutdown — saying it halted work for at least five weeks.

The FAA insisted Tuesday in a statement that its ongoing review of the 737 MAXs “shows no systemic performance issues” related to the flight-control system and “provides no basis to order grounding the aircraft.”

“Nor have other civil aviation authorities provided data to us that would warrant action,” the FAA said. “In the course of our urgent review of data on the Ethiopian Airlines Flight 302 crash, if any issues affecting the continued airworthiness of the aircraft are identified, the FAA will take immediate and appropriate action.”