Declassified UFO / UAP Document
U.S. Air Force Technical Information Questionnaire — Philadelphia, PA, 20 Dec 1966
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AI-Generated Summary
A civilian in Philadelphia reported a silent, gray, high-speed object resembling a jet on December 20, 1966. The Air Force concluded the object was likely an aircraft flying at a distance.
On December 20, 1966, at 1330Z, a civilian witness in the Northeast section of Philadelphia, Pennsylvania, observed a single, gray-colored object for a duration of five minutes. The witness, who was in a car at the time, described the object as appearing similar to a high-speed Air Force jet. However, the witness noted that the object did not produce the sound typically associated with such an aircraft. The witness provided a sketch indicating a side and top view of the object, with markings suggesting smoke or an exhaust trail. The weather conditions at the time were noted as dry with thick or heavy clouds. The official Air Force conclusion for this incident was that the object was possibly an aircraft, noting that the description was consistent with an aircraft observation and that the lack of sound could be attributed to the object being outside the audible range.
DID NOT SEEM TO HAVE ASOUND LIKE A JET SHOULD HAVE
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Official Assessment
Aircraft(possible). The description is consistent with that of an aircraft observation. The aircraft could have been just outside the audible range.
The observer reported a gray-colored object that appeared to be a high-speed Air Force jet but lacked the expected engine noise. The official conclusion suggests it was likely an aircraft flying outside the audible range.
Witnesses
- [illegible]Civilian