Airliner paced by small disc over Olympic Mountains.We were walking along a dirt road by our place outside of Shelton, WA., when I herd a deep roar of a jet engine. I looked up to see what the noise was about. I noticed an airliner going very slow, almost ready to stall, when I noticed a small silver line under the aircraft. I told my wife, and kids to look at that in the sky. We watched the littel silver craft pace the larger airliner, then the little craft shot ahead, and above , in front, of the airliner and shot off. They were both heading in a northerly direction at that point. The hole event lasted about 10 seconds.