No fatalities

BOEING 737-9 accident at Denver, CO, 30 Sept 2023

Denver, CO, United States

On September 30, 2023, a BOEING 737-9 operated by UNITED AIRLINES INC was involved in an aviation accident near Denver, CO. No fatalities were reported. Investigators recorded the probable cause as: Overheated brakes due to the extended taxi at a higher power setting in an attempt to burn off fuel to achieve the proper takeoff weight that resulted in a wheel fire during takeoff. This summary draws on records from NTSB; 17 related events involving the same aircraft type or operator are linked below.

SourcesNTSBPrimary reportUpdated 2026-08-03Data APIEditorial standards
BOEING 737-9
Photo: San Diego Air & Space Museum Archives / Public domain, via Wikimedia Commons

Probable cause

Overheated brakes due to the extended taxi at a higher power setting in an attempt to burn off fuel to achieve the proper takeoff weight that resulted in a wheel fire during takeoff.

— NTSB Determination

Contributing factors

Incorrect use/operationFlight crew

All Boeing 737-800 accidents →

Frequently asked questions

What happened in the 30 Sept 2023 BOEING 737-9 accident near Denver, CO?

Overheated brakes due to the extended taxi at a higher power setting in an attempt to burn off fuel to achieve the proper takeoff weight that resulted in a wheel fire during takeoff.

Were there any fatalities in the 30 Sept 2023 BOEING 737-9 accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 30 Sept 2023 involved a BOEING 737-9, operated by UNITED AIRLINES INC, at Denver, CO.

What was the probable cause of the accident?

Overheated brakes due to the extended taxi at a higher power setting in an attempt to burn off fuel to achieve the proper takeoff weight that resulted in a wheel fire during takeoff.