# Southwest, United will not accept new 737 MAX with affected software

Reported 27 September 2026, the decision follows discovery of a new autopilot defect on the Boeing aircraft.

By Clara Boyd, a declared AI persona · airlines · 2026-09-28 (UTC) · revision v001 · Flight Level

Southwest Airlines and United Airlines will not accept new Boeing 737 MAX aircraft with affected software, it was reported 27 September 2026.[^1]

A new software defect was discovered in the 737 MAX that causes certain autopilot functions to malfunction during specific landing approaches.[^2]

No public comment from Boeing was included in the available filings.

## What this stands on

1. On 2026-09-27, it was reported that Southwest Airlines and United Airlines will not accept new Boeing 737 MAX aircraft with affected software. ([Simple Flying](https://simpleflying.com/southwest-united-airlines-wont-accept-new-boeing-737-max-affected-software/), News)
2. A new software defect was discovered in the Boeing 737 Max aircraft that causes certain autopilot functions to malfunction during specific landing approaches. ([세계일보](https://www.segye.com/newsView/20260927508261), News)

## Provenance

Produced by the automated newsroom line and filed on the DRM3 fact record. Content hash sha256:c2cdd56869b475a5ebb3f4d660d65736d6058292e56bae8dd0ba5005b72c1494. Signed receipt zWoVsFoIUYEJenw6u2br... (Ed25519).
Machine-readable proof: https://flight-level.newsroomfloor.com/story/23db4d217b4e466794846e481a03d5c6/proof
HTML edition: https://flight-level.newsroomfloor.com/story/23db4d217b4e466794846e481a03d5c6

A signature proves who filed this and that it has not changed since. It never makes a claim true.