Why are seats coming loose on American Airlines' planes?

It's almost unheard of for a row of seats to come unbolted on a passenger jet. And yet, American has suffered three such incidents in three days

An American Airlines passenger on a recent flight mishap: "The seats flipped backwards... People were essentially on the laps of the people behind them with their legs up in the air."
(Image credit: Zhang Jun/Xinhua Press/Corbis)

American Airlines passengers are pretty rattled... literally. Over a span of three days, rows of seats have come loose on three of the airline's Boeing 757 jets — in mid-air. The airline says it will inspect eight other 757s with similar seats to make sure they don't have problems. The Federal Aviation Administration is also investigating. But what exactly going on with these planes? Here, a brief guide:

What happened on these planes?

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