Science: Safety Bubbles in the Sky

The FAA approves a new system to avoid collisions

Still as trim and erect as he was in his days as a Marine test pilot, J. Lynn Helms, 56, the new Federal Aviation Administrator, climbed aboard a little two-engine Cessna, throttled down the runway at Washington National Airport and gave chase to a Boeing 727. He made six breathtakingly close passes at the larger aircraft, almost as if he were knocking MiGs out of the skies over Korea. Last week, several days after that acrobatic performance, Helms disclosed what he had decided...

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