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Southwest Airlines Boeing 737 MAX aircraft in storage in Victorville, California. Photo: Mark Ralston/AFP/Getty Images

Boeing said Sunday it knew of a safety alert flaw in the cockpit of its 737 MAX jetliners months before the first of 2 fatal crashes involving the now-grounded aircraft, but it didn't immediately notify regulators.

Details: The issue concerns a warning light in the cockpit, known as the AOA Disagree alert. This alert is meant to notify the flight crew that two angle-of-attack (AOA) sensors are providing data that disagree with each other, which suggests one is erroneous. The company said in a statement the aircraft’s "display system software did not correctly meet" the AOA alert requirements in 2017 — well before October's Lion Air crash in Indonesia, which killed 189 people.

The big picture: A Federal Aviation Administration official told Reuters that Boeing waited 13 months before reporting the issue in November. Southwest Airlines told CNBC that Boeing didn't inform it about the issues until after the Indonesia crash. It's unclear if Boeing reporting the warning light issues could've prevented the Lion Air crash or March's Ethiopian Airways disaster, which killed 157 people.

What they're saying: Boeing said neither the AOA indicator nor the AOA Disagree alert identified in the flaws are necessary for the safe operation of a plane. "They provide supplemental information only, and have never been considered safety features on commercial jet transport airplanes," it said.

Detailing the issue, Boeing said in 2017, "within several months after beginning 737 MAX deliveries, engineers at Boeing identified that the 737 MAX display system software did not correctly meet the AOA Disagree alert requirements."

Why it matters: Boeing is the world's largest aerospace company, and its fortunes can ricochet throughout the economy, per Axios science editor Andrew Freedman. As federal investigators examine the two crashes and evaluate the safety of the plane, this latest issue raises questions about Boeing’s candor with regulators.

The 737 MAX's success is essential to Boeing's future, given that the airline has thousands on order.

Go deeper:

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Exclusive: Houston mayor to lead Black mayors group

Houston Mayor Sylvester Turner speaks during a private funeral for George Floyd. Photo: Godofredo A. Vásquez/Pool/Getty Images

The mayor of the city where George Floyd was raised is taking over a group that represents 500 Black mayors in the U.S. amid national pressure to revamp police departments.

Why it matters: Houston Mayor Sylvester Turner will become the new president of the African American Mayors Association as municipalities across the country examine police reforms and deal with the economic fallout from the pandemic.

Delivery industry sees biggest monthly job losses in more than 20 years

Data: U.S. Bureau of Labor Statistics; Chart: Axios Visuals

The pandemic's biggest job winner is losing steam.

Driving the news: People who deliver packages to businesses and homes — classified as "couriers and messengers" by the Labor Department — saw the industry's biggest monthly job losses in more than 20 years in April.

FDA authorizes Pfizer COVID vaccine for 12- to 15-year-olds

Photo: Gabby Jones/Bloomberg via Getty Images

The Food and Drug Administration authorized the emergency use of the Pfizer-BioNTech coronavirus vaccine for 12- to 15-year-old adolescents, the agency announced on Monday.

Why it matters: The emergency authorization marks a critical milestone in the push to get more Americans vaccinated and fully reopen schools for in-person learning this fall.