Scores of pilots and flight attendants have suffered brain and nerve damage akin to battered NFL players after breathing toxic fumes leaking into airplane cockpits and cabins, according to an investigation.

Since 2010, airlines have filed thousands of reports with the Federal Aviation Administration warning toxic fumes are seeping into cockpits and cabins. The leaks come from a system that draws in engine air and pushes it through the plane unfiltered, according to the Wall Street Journal.

The number of cases has surged in recent years, with Airbus’s widely used A320 jets at the center of the spike, records obtained by the Journal show. 7

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One Delta jet bound for South Carolina was forced back to Atlanta after thick white smoke poured through overhead vents in the cabin, sending

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