Drone and Balloon, Same Afternoon: The Ground Stop at San Diego International

A drone hovering near San Diego International Airport's control tower — with an unrelated high-altitude test balloon complicating the picture at the same time — shut down departures at one of the busiest travel weekends of the year.

Multiple Drones, Close to the Tower

Just before 2 p.m. on September 4, air traffic controllers and airport staff became aware of drone activity near the airfield. Some traveler accounts described a small aircraft seen hovering just tens of feet above the control tower itself — close enough that the concern wasn't abstract: an uncontrolled drone sharing airspace with departing and arriving airliners, at an altitude where a collision is genuinely possible, is exactly the scenario that triggers an immediate ground stop rather than a cautious wait-and-see.

A Balloon Complicated the Picture

Compounding the situation, a separate high-altitude balloon was independently being tracked in the broader regional airspace around the same time — reported as a stratospheric telecommunications test platform on a return leg from a New Mexico-to-Japan test flight, not a meteorological weather balloon. Controllers dealing with an unauthorized drone sighting don't get to assume every additional unusual radar or visual return is unrelated — a second airspace anomaly showing up in the same window means more caution, not less, until each one is independently accounted for.

A Full Stop, Not a Slowdown

Rather than simply space out arrivals, the airport went to a full ground stop: no departures at all while the situation was assessed. That decision, on the Thursday before Labor Day weekend, meant hundreds of travelers caught in cascading delays and diversions that rippled outward to other airports as inbound flights had nowhere to land on schedule.

A Multi-Day Ripple Effect

The disruption's effects didn't end with the ground stop itself — residual delays continued into September 5, the kind of network-wide knock-on effect that a single afternoon's airspace incident at a busy airport can produce well after the original cause has passed.

What This Wasn't

No aircraft was involved in a collision or accident; this is a security/airspace-management event, not an NTSB matter.

This reconstruction was researched from official investigation records where they exist, the original air traffic control recording, and contemporary reporting. The aircraft movement, timeline and written account were assembled independently by Flight Follower. Where an investigation is open or no probable cause has been published, the account says so rather than offering one.

Timeline

Accident Facts

Sources

• SanDiegoVille, "Mysterious High-Altitude Airship Spotted Above San Diego As Drone Shuts Down Airport Operations"
• The Traveler, "Drones and High-Altitude Balloon Disrupt Flights at San Diego" and related coverage
• Travel Tourister, "San Diego Airport Chaos: Drones, Balloon Trigger Ground Stop"