CLAIM-953014reported
“Hall reports Captain Rick Olsen and the first officer of a Canadian Air International flight at 31,000 feet observing a weather-radar target about fifty miles away at approximately their altitude/course for about four minutes; the geometry yielded an apparent speed estimate near 5,400 mph.”
The UFO Evidence, Volume II: A Thirty-Year Report
SRC-009500 · Canadian Air International weather-radar case summary; uploaded PDF pp. 261-261