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»r @ @ 6/20/73 AIRTEL AIRMAIL TO: ACTING DIRECTOR, FBI (164-2111) FRO: SAC, SEATTLE (164-81) (P) SUBJECT: NORJAK OG: SEATIFLE Re Bureau letter to Seattle, dated 6/3/73. Referenced communication enclosed a Letter fron[.S™~™~—CCCOC Wt CaaS: Offered two possible solu- tions to captioned matter. Seattle Division's comments to the feasibility and plausibility of these solutions were requested by the Bureau. One of the solutions was deseribed ky [as follows: L This is not plausible because the point at which the hijacker left the aircraft was determined by tira correlation of a tape recording of the comments of the crew during a “pressure oscillation." This oscilla- tion was later determined to be caused by outside air pressure forcing closed the air stairs, thereby causing an increase in air pressure inside the plane, sinilar to shutting a car door with the windows up. This 2~ Bureau . 2—- Minneapolis (164-73) (2)~ Seattle a ‘RNNeskn - (6) j 4 b6 b7C b6 b7C b7D