Analysis of Flying Object Incidents in the United States, 1949

This declassified Air Intelligence Report No. 100-203-79 is a Top Secret study by the Directorate of Intelligence, Headquarters USAF, and the Office of Naval Intelligence, dated 10 December 1948. It looks at about 210 reported flying object incidents and concludes that some type of flying object has been observed, though what the objects are and where they come from cannot be determined. It considers domestic devices or Soviet aircraft based on German flying wing designs, and its appendices cover selected reports, explained cases and flying wing aircraft.

From the source: Release of 2026-07-10 Incident: 4/28/49, Virginia. This file contains a U.S. Air Force (USAF) Air Intelligence Division study, “Analysis of Flying Object Incidents in the United States,” Study No. 203, dated 04/28/1949. The analysis includes an assessment of various reported unidentified flying object (UFO) incidents and theories to account for their nature and origin. Overall, the study assesses that “it appears that some object has been seen; however, the identification of that object cannot be readily accomplished.” The study offers that two “reasonable” origins might account for the phenomena: technologies of a domestic or foreign origin. It also suggests that, if foreign, it is prudent for the United States to assume that UFO observations are attributable to scientific, military, or intelligence activities of the Soviet Union, and, in that case, to take seriously the threat such objects may pose. The file also contains selected contemporary UFO reports and examples of experimental “flying wing” type aircraft planforms that might account for certain commonly reported UFO characteristics. AARO Comment: This file appears to be a later revision of the file contained in DOW-UAP-D093, whose content is substantively similar.

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d. FAMILIARIZATION FLIGHTS OVER U.S. TERRITORY. This possible reason ls perhaps the
most lmproo Ele. It r assum d: th t. hoti.la Hi£ purpose oe involved, other purposes are prob
ably also accomplished in its execution. Provided the U .S.S.R. has wiusually high performance
aircraft they might. find 1t advantageous to familiarize themselves with the topography of the U.S.
1n antlclpation of future combat missions to strategic targets.
6. CONCLUSION. The conclusion that some type of flying object has been observed over the U.S.
see~tantiated. It 1s not known at thls time whether these observations are xn1sidentifl
cations of domestically launched devices, natural phenomena, or foreign unconventional aircraft·. It
ls, therefore•, impossible to make any rellable explanation for their appearance over the U.S. or the
tactics wh1ch they may employ 1f the objects observed include any forelgn developments 1n aero
nautical fields. It 1s likewise impossible ·at this time to contain discussions of possible perform
ance characteristics or tactics within limits of practical reason, i:f for no other reason than the
fact that proof of. the existence of a foreign development of this type would necessarily . introduce
considerations of new principals and means not yet considered practical possibll1t1es 1n our own
research and development.
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