Did Space Debris Hit A United Flight Over The Rockies Thursday? Here’s What We Know So Far

A United flight from Denver to Los Angeles diverted to Salt Lake City on Thursday. The airline reported that flight 1093 made the decision to address a crack in one layer of its windshield. But was the plane actually hit by space debris?

That’s one leading theory based on a photo shared by aviation watchdog JonNYC of the cockpit of the United Boeing 737 MAX 8 (registration N17327).

Photo NOT confirmed

Hearing there were scorch-marks, so space-debris or meteorite. pic.twitter.com/ird6QKEZv8

— JonNYC (@xJonNYC) October 17, 2025

The aircraft was carrying 140 passengers and cruising at 36,000 feet. A replacement aircraft took customers to LA, arriving six hours later than planned.

#AirportAlert United Airlines Flight UA1093, a Boeing 737 MAX 8 (N17327), took off from Denver (DEN) headed to LAX just 1hr ago—but now it’s diverting to SLC after a cracked window in the cockpit. Fire Dept is standing by waiting their arrival. #Aviation

Follow Here:… pic.twitter.com/oWtXlPyLKv

— SLCScanner (@SLCScanner) October 16, 2025

As of this writing, the aircraft that diverted remains on the ground in Salt Lake City more than a day later.

On modern airliners the forward windshields are laminated, multi‑ply, electrically heated structures designed to survive a single‑ply failure without loss of pressurization or bird penetration. A crack in one layer is consistent with:

• Windshield heat/connector fault leading to localized overheating, thermal stress, and cracking of a ply. This an leave heat discoloration or “scorchy” marks.

• Benign thermal/structural crack of a ply due to temperature gradients and residual stresses. This is a routine, known in‑service failure. The laminated construction is fail‑safe to continue flight, but procedure would typically involve crew descending to reduce pressure differentials, manage heat, and land at a suitable airport. That descent from 36,000 feet is exactly what you’d expect after a ply crack.

Given the altitude the plane was flying at, bird or hail impact is unlikely. The description of the issue being “one layer of its multilayer windshield” points to a ply crack rather than penetration.

Cracked windshield diversions are pretty common. Here are ones from last year on United, on American and Alaska. A Delta A330‑200 returned to London for a cracked windshield this summer.

So what’s the risk of space debris to aviation? An FAA report from 2023 estimated an annual 0.1% chance that falling space debris would cause a single global aviation casualty. That meant individual passenger risk was less than a trillion‑to‑one though projected to increase.

For space launches and reentry, the FAA now uses Debris Response Areas and Aircraft Hazard Areas to keep aircraft away from debris hazards at one‑in‑a‑million risk.

I haven’t found a single confirmed airliner debris strike on record. I’ve found old discussions noting the absence of any documented cases. It seems like the most likely scenario is windshield heat system arcing causing scorch marks. That doesn’t rule out other possibiltiies, of course.