The flight crew of Japan Airlines Flight 1628 are involved in a UFO sighting incident while flying over Alaska.

Japan Air Lines Cargo Flight 1628 was a Japanese Boeing 747-200F cargo aircraft flying from Paris to Narita International Airport that was involved in an unidentified flying object (UFO) sighting on November 17, 1986. During the flight, Captain Kenji Terauchi reported seeing three objects he described as "two small ships and the mothership". The FAA in Anchorage only saw Flight 1628 on their radar. Two other nearby planes only saw Flight 1628 and no other objects. An FAA investigation of the incident characterized Terauchi as a "UFO repeater". Astronomers and investigators have determined that Terauchi probably mistook the planets Jupiter and Mars as UFOs. Contradictions among the accounts of the crew from the three aircraft as well as contradictions between the transcripts and later interviews with Terauchi have cast doubt that anything unusual happened.

This is a list of notable reported sightings of unidentified flying objects (UFOs) some of which include related claims of close encounters of the second or third kind or alien abduction. UFOs are generally considered to include any perceived aerial phenomenon that cannot be immediately identified or explained. Upon investigation, most UFOs are identified as known objects or atmospheric phenomena, while a small number remain unexplained. UFOs have been referred to using a range of terms including the more specific "flying saucer" and the more general term "unidentified anomalous phenomena" (UAP). "UAP" is sometimes used to avoid cultural associations with UFO conspiracy theories.

November 17 is the 321st day of the year in the Gregorian calendar; 44 days remain until the end of the year.