Intell at Winnepeg disembark and debreif all passangers from a NW 727 after a close encounter over Lake Superior.

NW 727 in Jet route over Lake Superior from Detriot to Winnepeg.  Contacted Houghton Radio in Upper Michigan with a report of a "silver disk" going around the airplane, passing close to the wings.  Pilot said that all on board saw and were terrified.  Minneapolis center at Farmington contacted us (29th Air Divison, SAGE) and asked if we had contact on our radar with the aircraft and did we see any raw data near the 727.  I worked in Weapons on the third floor of the sage bldg. and was involved with some practice intercepts involving two ANG F-102 interceptors in a low altitude area just south of the Lake. Sawyer High at Mps Ctr called me and asked if I saw it.  I said that I did see the Airliner but not any extra raw data, but I said that I'd keep an eye on it.  2 Minutes later we saw a trail of something (eight raw paints) break south and it appeared to either go out of the atmosphere or into the lake before disappearing.
Date is approximate.  PD