The NTSB has released its preliminary findings into the unusual mid-air collision involving an United Airlines flight.
United Airlines flight UA1093, a Boeing 737-8 (registration N17327), which occurred on October 16, 2025, near Moab, Utah.
According to the U.S. National Transportation Safety Board (NTSB), newly analyzed data indicates the aircraft struck a high-altitude weather balloon operated by WindBorne Systems while cruising at FL360. The balloon, classified as a lightweight unmanned free balloon under CFR Part 101, had stopped transmitting just moments before the event. Investigators say it was drifting at approximately 35,900 ft on a near-reciprocal track with the 737 when the collision occurred.
The impact shattered the first officer’s forward windshield and caused minor lacerations to the captain, but the aircraft’s pressurization remained stable. Despite the damage, the flight crew maintained control of the aircraft and diverted safely to Salt Lake City. Upon landing, the captain received medical treatment for injuries sustained during the impact.
WindBorne Systems noted that the balloon was constructed from low-mass materials designed to minimize collision hazards, though the NTSB says the consequences of the strike underscore the risks posed by high-altitude uncrewed objects when communication links fail.
The damaged windshield has been sent to the NTSB Materials Laboratory for detailed examination. Specialists from the FAA, Boeing, United Airlines, and WindBorne Systems have joined the investigative team as the probe continues.
A final report with analysis and safety recommendations will be published at the conclusion of the investigation.
