One hundred feet. At final approach speed, that's less than half a second between a United 737 MAX 9 and whatever was hovering at 2,000 feet over Newark. No evasive maneuver. No time for one.
ATC didn't call the traffic. They couldn't see it.
Primary radar is engineered around aircraft-scale radar cross-sections — the reflective footprint of a fuselage, wings, engines. A consumer drone's RCS is orders of magnitude smaller. It doesn't disappear from radar because someone made a mistake. It disappears because the physics of the system were never designed to find it. A second aircraft independently reported the same drone, which means the object was real, persistent, and invisible to the people responsible for separating traffic.
Newark makes this worse by geometry. EWR sits beneath the New York TRACON's layered airspace structure — one of the most congested Class B environments in the country. Multiple approach paths converge over the same narrow corridors, with high-cadence traffic running tight sequences. That compression is exactly what efficient hub operations require. It's also what concentrates exposure when an unauthorized object enters the column.
FAA Part 107 prohibits drone flight above 400 feet AGL near airports without authorization. The rule exists. The enforcement mechanism doesn't — not in real time. Identification happens after the incident, if the operator is ever found at all. There are no gates. No tripwires. No automated alerts when an unregistered drone climbs through controlled airspace.
What remains is the near-miss reporting system itself — pilots filing ASRs after the fact, creating a statistical record of encounters that were already over before anyone knew they'd begun.
The airspace over Newark was built to keep aircraft apart. The threat it faces now moves faster than the paperwork designed to track it.