The FAA said in a statement Friday that a Delta Air Lines Boeing 747 arriving at John F. Kennedy International Airport came close to a Shuttle America Embraer E170 departing from LaGuardia Airport at around 2:40 p.m. on June 13.
The FAA says the planes were about a half-mile apart horizontally and 200 feet vertically. The required separation is 3 miles horizontally or a thousand feet vertically.
The agency isn't sure if a warning system went off alerting the pilots of the problem.
The FAA says the aircraft were "turning away from each other at the point where they lost the required separation." Both aircraft landed safely.
Both airlines say they will have more details soon.