On 28 January 1994, the crew of Air France Flight 3532 near Coulommiers reported a large disc-shaped object.

Air France 3532 matters because it is a commercial-aviation radar-visual report.
Documented
The AF-3532 crew reported a large disc-shaped object
Debated
The identity of the object
Unverified
Extraterrestrial origin
Sources are kept in separate layers: official and contemporary material is documented; secondary UFO literature is treated as debated, not as primary evidence.
Documented source.
Secondary / debated material.