Frequent business traveler Allen Crockett learned a painful lesson about how wind turbulence can jolt even big airline jets.

He bolted for the lavatory before landing during what had been a calm American Airlines flight from Chicago to Raleigh, N.C., in 2006. But the MD-80 suddenly lurched violently, banging Crockett's left knee against the toilet bowl to partially tear a ligament and his right hand against molding to rupture a tendon.

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