In a god’s-eye view of 24 hr. of air traffic tracks over the North Atlantic on April 21 (see grahic), a look available for the first time through the first eight Aireon satellite payloads that came to life this spring, there are columns of diamond shapes, outlines of “dead zones” with no tracks. More than a geometric puzzler, the shapes represent inefficiency. The dead zones exist in large part because there is no surveillance network capable of radarlike update speeds ...

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