Abstract: Employee #1, a flight instructor, had a student pilot in an airplane with him. The student was qualifying on instrument readings. The plane was flying at approximately 2,200 ft and was approaching Arlington Airport. Another small aircraft (#2) flew across the flight path of Employee #1's plane. Speculation was that Employee #1 and the student directed their attention to the passing plane, as did another plane (#3) that had intersected the same flight path intending to land at Boeing Field. Six seconds after plane #2 passed, planes #1 and #3 collided. Employee #1 was killed. Medical examiners listed causes of death as (a) visceral (internal) lacerations, (b) bone fractures, (c) partial amputation of the legs, and (d) blunt impact to body.