An Identified Flying Object (IFO) is an object that was originally classed as unidentified and has, upon subsequent investigation, been identified as a conventional object or natural phenomenon. Approximately eighty to ninety percent of all UFOs reported are eventually classified as IFOs.

Contactees sometimes refer to UFOs as IFOs because they believe them to be extraterrestrial spacecraft and therefore not ‘unidentified’

See Also

Anomalistic Observational Phenomena

Unidentified flying object

Unidentified Submarine Object