(The Hill) -- The Federal Aviation Administration (FAA) has received thousands of reports since 2010 about toxic fumes from jet engines leaking into the cockpit and cabin of airplanes, according to an investigation done by The Wall Street Journal.

The leaks are due to a commonly used airplane design known as “bleed air” that pulls air from the engine into airplanes so those onboard can breathe.

The increase in reports is largely driven by Airbus A320s, which the three largest U.S. airlines use. The aircraft reported seven times the rate of fume events as their Boeing 737, which does not use the “bleed air” design.

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