The Boeing 737 MAX is an update to the 737NG, built in response to high demand for a refreshed 737.
The A320neo is essentially a standard A320 family aircraft with Sharklets and new engines, so Boeing largely did the same.
However, the 737 MAX has faced more issues than almost any other airliner in recent history
The MCAS system was developed to address a pitching-up characteristic at high angle of attack due to the new CFM LEAP engines.
MCAS adjusted the stabilizer trim down to counter the pitch-up movement and ensure similar flight characteristics as prior 737s.
However, sensors are notorious for failing, and if the AOA sensor malfunctions, MCAS could activate repeatedly, even if the aircraft is flying normally.
The new MCAS system now relies on data from both of the 737's AOA sensors to provide redundancy.
This redesign significantly improves safety by reducing the risk of repeated activation in case of a malfunction.
Boeing has redesigned the MCAS system to be safer and more reliable, addressing concerns raised by recent fatal crashes.
Boeing's redesign of the MCAS system significantly improves safety
