On 4 September 1957, four Portuguese Air Force F-84 Thunderjets commanded by General José Lemos Ferreira reported encountering an object during a night exercise. The object identity was never settled.
Lemos Ferreira matters because it is a named military formation encounter with multiple pilot witnesses — a case whose object identity remains unresolved.
Four Portuguese Air Force F-84 Thunderjets commanded by General José Lemos Ferreira departed Ota Air Base for a night exercise over Portugal and Spain.
Documented
The exercise is documented.
The formation reported encountering an object. Portuguese Air Force witness statements exist.
Documented
The witness statements are documented.
The object identity remains disputed, with aircraft or atmospheric readings proposed. No photograph or radar is established.
Debated
The object identity is disputed.
The case rests on military witness statements. No photograph or radar is established.
Unverified
Any extraterrestrial origin is unverified.
These sources do different jobs: the Portuguese Air Force statements are the official record, and Flying Saucer Review is secondary. Neither establishes the object identity.
The official statements.
A later treatment, recorded as secondary.