(CNN) Just months before a second deadly crash of a Boeing 737 Max airplane, American Airlines pilots angrily confronted a Boeing official about a computerized anti-stall system that preliminary reports have now implicated in both deadly wrecks, audio obtained by CBS News reveals.

The meeting between the pilots and Boeing happened in November -- just weeks after an October crash of a Lion Air 737 Max into the Java Sea, and four months before a 737 Max operated by Ethiopian Air crashed in Ethiopia.

On the audio, a Boeing official is heard telling pilots that software changes were coming, perhaps in as little as six weeks, but that the company didn't want to hurry the process.

The pilots indicated they weren't aware of the 737 Max's computerized stability program -- the Maneuvering Characteristics Augmentation System, or MCAS.

"We flat out deserve to know what is on our airplanes," a pilot is heard saying.