Summary
JAL cargo captain Kenju Terauchi reported a massive walnut-shaped craft pacing his 747 over Alaska for nearly an hour, tracked on both aircraft and ground radar.
Detail
In November 1986, Japan Air Lines Flight 1628 cargo captain Kenju Terauchi, crossing Alaskan airspace, reported a massive walnut-shaped craft pacing his Boeing 747 for nearly an hour, which he estimated at roughly twice the size of an aircraft carrier. Both the aircraft's radar and ground radar registered returns. The FAA confirmed the radar data. The Japanese crew was briefly grounded before international pressure led to their reinstatement. The case draws attention for its multiple corroboration across civilian and ground radar.
