American Airlines Group Inc. pilots want the carrier to offer more training on Boeing Co.'s 737 Max to better understand new anti-stall software, after a preliminary report on an Indonesia plane crash suggested that aircraft malfunctions left aviators overwhelmed.

The Allied Pilots Association made the request after what the union said was an unprecedented meeting with Boeing officials this week. The manufacturer also met with Southwest Airlines Co.'s pilots union. Both carriers fly the Max, Boeing's latest iteration of the popular 737 jetliner. The new model replaced an older version called the next generation, or NG.

The APA is asking American "to consider additional days of training for these significant differences in the NG and the Max," said Dennis Tajer, a spokesman for the union and a 737 captain at the airline.