A United Airlines flight operating from San Francisco to San Diego reportedly encountered a possible drone strike shortly before landing on Wednesday morning, raising fresh questions about the growing risks posed by small unmanned aircraft near major airports. The aircraft, a Boeing 737-800 , landed safely at San Diego International Airport (SAN), with no injuries reported, and no damage found after inspection.

The incident is especially concerning because the object was reportedly seen at around 3,000 feet, far above the normal operating area for most consumer drones, and directly in the arrival path of commercial aircraft. While the FAA is investigating, and it has not yet been confirmed that the object was a drone, the report highlights one of the more difficult safety problems facing commercial aviation: how to protect aircraft from small, cheap, hard-to-detect objects in busy terminal airspace.

A Safe Landing After A Possible Drone Strike

Credit: Shutterstock

United Flight 1980 was operating from San Francisco International Airport (SFO) to San Diego, and on approach to the airport shortly after 8:00 am local time when the crew reported a possible drone strike during the final stages of the flight. The 737 was carrying 48 passengers and six crew members on the short intra-California hop that typically takes a little over an hour.

NBC San Diego reported that the aircraft didn’t declare any emergency, and landed safely shortly before 08:30. Simple Flying reached out to United, and the airline shared the following:

“United flight 1980 reported a potential drone prior to arriving in San Diego. The flight landed safely, and customers deplaned normally at the gate. Our maintenance team found no damage after thoroughly inspecting the aircraft.”

The pilots’ ATC report is what makes the incident stand out. According to the Los Angeles Times, the crew described seeing a small object on the base leg of the approach. The air traffic controller then asked the crew for more details: “Do you have like approximate size or how many engines or style or anything like that?” The pilot responded: “It was so small I couldn’t tell. It was red … it was shiny.”

The Dangers Of Drones

Credit: Shutterstock

The basic safety issue is that a drone is not a bird. Birds are largely soft tissue, while even small consumer drones can contain metal, hard plastics, electric motors, cameras, circuit boards, and dense lithium-ion batteries. That makes the damage pattern potentially very different from the bird strikes that commercial aircraft are designed to withstand.

The greatest risks depend on the size of the drone and where it might hit the aircraft. A small drone striking a reinforced panel might only trigger a maintenance inspection. A larger or heavier drone hitting a windshield, entering an engine, striking a sensor, or damaging a flight control surface could create a much more serious situation, particularly during takeoff or landing when pilots have less time and altitude to manage a problem.

Federal Aviation Administration (FAA) guidance generally limits drone operations to below 400 feet in most locations, and flights in controlled airspace around airports usually require FAA authorization. The FAA also says it receives more than 100 drone-sighting reports near airports each month, and warns that unauthorized drone operations around aircraft, helicopters, and airports are dangerous and illegal.

The military dimension has expanded the concern considerably in recent years. Cheap drones have become heavily used and highly destructive weapons in Ukraine and the Middle East in recent years. It is not a stretch to imagine the technology being used by terrorists to attack commercial aircraft. While there is no indication that the event in San Diego was malicious, a suspected drone at around 3,000 feet in a commercial arrival corridor is precisely the kind of scenario that aviation authorities worry about.

Related

United Airlines Pilot Injured After High-Altitude Debris Cracks Windshield

The 737 MAX could have been struck by space debris or a meteorite.

But Was It Actually A Drone?

Credit: Shutterstock

For now, the answer is still uncertain. The pilots reportedly saw something small, red, and shiny, but even their own description suggests they did not have a long or detailed look at it. The Los Angeles Times reported that the crew could not identify the object’s size, number of engines, or style, with the pilot saying it was too small to tell.

That uncertainty matters, because confirmed drone strikes involving manned aircraft in the United States have been rare, and the best-documented cases have overwhelmingly involved helicopters rather than airline jets. Indeed, if the investigation does conclude that it was a drone strike, it would very likely be the first confirmed incident on a commercial aircraft.

The FAA is investigating the incident, but the absence of visible damage to the aircraft means investigators may have limited physical evidence to examine. If it was a drone, however, the incident would mark a concerning new chapter for commercial aviation. Airline crews already train for bird strikes, engine failures, rejected takeoffs, and unstable approaches. A small, hard-to-see drone at 3,000 feet adds a different kind of threat: one that is cheap, mobile, difficult to detect, and potentially capable of appearing in precisely the airspace where a commercial aircraft has the least room to maneuver.