◆ SpookStack

| SE 164-81 UNIDENTIFIED object high on a bluff on the south side of the lake, a short distance from the flight pattern of the hijacked aircraft. Attempts were made by helicopters to view this unidentified object with negative results due to hazardous flying conditions, low clouds and rain storms. This item will be the subject of intensive search immediately by helicopters taking off on 11/27/71, and will be considered a prime search It is felt that the pilot and crew of the hijacked aircraft should be questioned concerning the lights on the plane going off, from 3:00 to 8:15 PM, to determine if this was in fact the hijacked aircraft. Further, it is felt that the crew of this plane should be asked a specific question of why they continued the flight to Reno, when the feeling of the pilot and crew was that the subject exited the plane at or about the Lake Merwin vicinity. Further it is felt that the pilot and crew should be specifically asked if they had visual sitings of landmarks on course cf the hijacked aircraft, particularly in the suspected drop area. It is to be noted in ths regard, that a £lashing radio beacon at Kalama, Washington, could have been viewed by the hijacker at the altitude which the plane was flying at that time. Intensive search with four helicopters will be resumed at approximately 8:30 Af, 11/27/71, with concentration of search area being in the vicinity of the east side of plotted line per conversation with SAC. DB Cooper-1/746