Seattle (CNN) Pilots from the three American carriers that fly Boeing 737 MAX planes tested software changes developed by Boeing to a key stabilization system on Saturday, a person briefed on the tests said.

The changes are intended to decrease the chances of triggering the Maneuvering Characteristics Augmentation System, or MCAS, which is believed to have played a role in the Lion Air crash in October.

The Federal Aviation Administration has said there are similarities between that crash and a second 737 MAX crash earlier this month in Ethiopia.

Pilots and training officials from Southwest Airlines, American Airlines and United Airlines met with Boeing officials Saturday to review the software changes in the Seattle area, where the model is assembled, according to multiple airline sources.

At the gathering, pilots from the three American carriers, plus two smaller non-US airlines, ran simulated flights designed to mimic the situation that brought down the Lion Air flight in Indonesia last year, using the current and updated software, according to the person briefed on the session.

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