WestJet first told Boeing about 737 MAX software g

TL;DR: WestJet pilots first flagged a flight-computer software anomaly on a 737 MAX during a 2024 validation flight and told Boeing, prompting an FAA review that delayed certification of the larger MAX 10 until Boeing provides a software fix and procedures, according to multiple reports and regulator statements.

WestJet told Boeing about an on-board navigation or go-around guidance anomaly on a 737 MAX during a 2024 flight test, prompting a regulatory pause while the FAA and Boeing examined whether the software affected pilot control and certification of the MAX 10. According to reporting, the issue was first identified by WestJet pilots during a validation flight in 2024 and then raised with Boeing engineers and regulators https://www.airdatanews.com/faa-clears-737-max-software-glitch-removing-hurdle-for-max-10-certification/.

Why WestJet telling Boeing matters

Airlines matter to manufacturers because their validation flights can confirm normal operation or reveal edge-case behaviour that lab tests miss. The US Federal Aviation Administration treated the WestJet report as material enough to delay certification of the MAX 10 until the anomaly was understood and mitigations were approved, according to reporting that the FAA will not certify the MAX 10 until a go-around flight guidance software glitch is fully understood https://migflug.com/afterburner/fr/boeing-737-max-10-certification-delayed-faa-software-go-around-2026/.

The FAA and other regulators framed the problem around pilot control and guidance. The FAA cleared the specific software anomaly later, saying pilots retain full control of the aircraft, a point made in coverage of the FAA’s review and eventual clearance for the affected systems https://www.airdatanews.com/faa-clears-737-max-software-glitch-removing-hurdle-for-max-10-certification/. Other outlets reported similar regulatory actions and noted the effect on Boeing’s certification timeline https://timesofindia.indiatimes.com/technology/tech-news/us-faa-clears-boeing-737-max-software-issue-removes-hurdle-for-max-10/articleshow/134657479.cms.

Regulatory and market consequences

Regulators treated the anomaly as important enough to pause approval for the 737 MAX 10. The CTV News report captured immediate market reaction, noting Boeing shares fell about 7 percent when the U.S. federal regulator delayed certification of the MAX 10 while it investigated the issue https://www.ctvnews.ca/business/article/us-federal-aviation-regulator-delays-boeing-737-max-10-certification-shares-dive-7/. Boeing’s overall delivery cadence continued to recover, with Reuters reporting the company delivered 64 jetliners in June 2026, up from 60 in June 2025, showing the company’s production did not halt entirely while regulators reviewed software specifics https://www.reuters.com/business/aerospace-defense/boeing-records-highest-first-half-deliveries-since-2018-2026-07-14/.

How Boeing and regulators reacted

Boeing worked on both a procedural mitigation for pilots and a software fix, according to reporting that described the company developing guidance for flight crews while engineers updated code and testing plans https://www.wsj.com/business/airlines/new-boeing-737-max-software-glitch-could-disrupt-navigation-feature-d537b8d8. The FAA signalled it was taking the issue seriously; one report quotes the FAA administrator (identified as Administrator Bryan in the coverage) saying the agency would wait for understanding of the go-around guidance software before certifying the MAX 10 https://migflug.com/afterburner/fr/boeing-737-max-10-certification-delayed-faa-software-go-around-2026/.

A concrete example: a validation flight scenario

A WestJet validation flight in 2024 ran standard procedures for a route-proving sortie. During a simulated missed approach, the flight crew saw the flight-management navigation guidance give an unexpected lateral or vertical cue that differed from the expected go-around path. The crew reported the unusual guidance to Boeing engineers after landing, who then compared the event to flight-data records and the software’s guidance logic. That kind of real-world anomaly, reported by airline crews, is precisely the sort regulators cited when explaining why they paused certification pending a fix https://djsaviation.net/westjet-told-boeing-of-737-max-problem/ and https://www.airdatanews.com/faa-clears-737-max-software-glitch-removing-hurdle-for-max-10-certification/.

Trade-offs: speed versus conservatism

Regulators faced a trade-off. Holding certification slows aircraft deliveries and can cost manufacturers in market share and stock value; Boeing saw a short-term share impact when the FAA paused MAX 10 approval https://www.ctvnews.ca/business/article/us-federal-aviation-regulator-delays-boeing-737-max-10-certification-shares-dive-7/. Letting aircraft into service without fully understanding edge-case software behaviour risks safety and later, more costly fixes. The FAA’s clearance later that pilots retained full control addressed that balance for this specific anomaly, but regulators kept scrutiny until procedures and code changes were validated https://www.airdatanews.com/faa-clears-737-max-software-glitch-removing-hurdle-for-max-10-certification/.

What airlines and pilots should do now

Airlines should track Boeing service bulletins and FAA airworthiness directives and incorporate any interim procedures into simulator training. Pilots need to study the procedural guidance Boeing provided while the software was patched, and fly the updated go‑around profiles in simulators until the change becomes routine. Transport Canada indicated it would lift specific MAX restrictions with unique measures in place on January 20, 2024, showing national regulators may add their own conditions even after an FAA clearance https://skiesmag.com/news/737-max-cleared-return-canadian-airspace-unique-measures-announced/.

A caveat from the reporting

Not all outlets had identical detail. Some reports emphasized the risk to certification timelines and stock prices, while others focused on pilot control and the FAA’s final technical judgment that pilots retained control. Timelines remain contingent on regulator testing and Boeing’s software updates because the FAA linked certification to understanding the go-around guidance behaviour https://migflug.com/afterburner/fr/boeing-737-max-10-certification-delayed-faa-software-go-around-2026/.

Actionable steps you can take today

If you work for an airline, subscribe to Boeing and FAA notifications, update simulator syllabi, and brief crews on interim procedures. If you’re a passenger concerned about safety, check your carrier’s fleet notices and the regulatory status for the aircraft type on official sites before booking. Boeing’s production numbers meanwhile show the company continued deliveries, 64 jets in June 2026, compared with 60 the previous June, so production and operational deployment are still moving even as regulators finish reviews https://www.reuters.com/business/aerospace-defense/boeing-records-highest-first-half-deliveries-since-2018-2026-07-14/.

Frequently Asked Questions

Q: Did the software glitch make the aircraft unsafe? A: The FAA concluded for the specific anomaly that pilots retain full control, which is why the agency cleared the issue after Boeing provided fixes and procedures https://www.airdatanews.com/faa-clears-737-max-software-glitch-removing-hurdle-for-max-10-certification/. Different regulators applied their own measures while they reviewed the same data https://skiesmag.com/news/737-max-cleared-return-canadian-airspace-unique-measures-announced/.

Q: Who first reported the problem? A: Reporting indicates WestJet pilots first identified the anomaly during a 2024 validation flight and informed Boeing, which then coordinated with regulators https://djsaviation.net/westjet-told-boeing-of-737-max-problem/ and https://www.airdatanews.com/faa-clears-737-max-software-glitch-removing-hurdle-for-max-10-certification/.

Practical takeaway

Track official FAA and Boeing notifications and treat interim procedural guidance as binding until regulators confirm software updates. Keeping procedures and simulator practice current reduces risk for airlines and passengers while regulators complete technical verification.