Imagine cruising at 36,000 feet, the world a distant blur below, when suddenly your windshield shatters. That’s precisely what happened to the pilots of a United Airlines Boeing 737-8 on October 16, 2025. A preliminary report from the National Transportation Safety Board (NTSB) suggests a rogue high-altitude weather balloon might be the culprit behind this alarming mid-air incident.
The flight, United Airlines 1093, was en route from Denver to Los Angeles with 111 people on board. While cruising over Utah, the aircraft encountered an unknown object. The impact was immediate and violent, shattering the first officer’s forward windshield and showering both pilots with glass. Thankfully, the flight crew’s swift actions ensured a safe diversion to Salt Lake City International Airport (SLC).
A Sudden and Violent Impact
The incident occurred around 6:43 a.m. Mountain Daylight Time. The captain reported spotting an object on the horizon just moments before the collision. The loud bang and the immediate shattering of the windshield were terrifying. While the captain sustained multiple superficial lacerations to his right arm, the first officer and the 109 passengers and two flight attendants onboard were thankfully unharmed.
Following the impact, the flight crew expertly initiated a descent and followed emergency procedures, including addressing an illuminated window overheat light. The captain, after tending to his injuries, resumed flying duties and executed an uneventful landing in Salt Lake City. This demonstrates the incredible professionalism and training of airline crews.
Focus on a High-Altitude Weather Balloon
The NTSB’s investigation quickly turned to potential objects in the collision area, including weather balloons, other aircraft, and reentry objects. The investigation has zeroed in on a Global Sounding Balloon (GSB) operated by WindBorne Systems Inc. This unmanned free balloon was launched from Spokane, Washington, and was in the vicinity of the airliner at the time of the incident.
Data shows that WindBorne lost contact with the GSB between 6:36 a.m. and 6:43 a.m. MDT. Its last reported altitude was 35,936 feet, placing it almost exactly at the 737’s cruising altitude of 36,002 feet. The flight data recorder confirmed the 737 was traveling southwest at 395 knots, putting it in the same airspace as the balloon’s last known location.
Understanding the Components Involved
WindBorne describes their GSBs as lightweight platforms made from thin plastic film, designed to minimize damage upon impact. They don’t contain large metal structural elements. In contrast, the Boeing 737’s windshield, manufactured by PPG Aerospace, is a robust composite structure certified to withstand the impact of a four-pound bird without penetration. It features multiple layers, including a structural inner pane and a non-structural outer pane.
The damaged windshield has been sent to the NTSB Materials Lab for detailed examination, along with the flight data and cockpit voice recorders. The NTSB has invited relevant parties, including the FAA, WindBorne Systems, Boeing, and United Airlines, to participate in this ongoing investigation to determine the exact cause and prevent future occurrences.
- United Airlines flight 1093 diverted safely after striking an object.
- The incident occurred at 36,000 feet over Utah on October 16, 2025.
- The aircraft’s windshield was shattered, injuring the captain.
- A high-altitude weather balloon operated by WindBorne Systems is the suspected object.
- The NTSB is conducting a full investigation with all involved parties.
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