> This follows what made the A320neo popular, Airbus took a older venerable design and re-engined it for higher efficiency. Though note the A320 is a newer des

> This follows what made the A320neo popular, Airbus took a older venerable design and re-engined it for higher efficiency. Though note the A320 is a newer design than the 737; the A320neo as a result didn't have the big problem of the 737 MAX: because its landing gear was always longer, because it was always designed for high-bypass turbofans, it could easily fit the larger engines under its wings without having to relocate the engine mounting. The 737 MAX is a world away from the original 737 (hell, the shortest 737 MAX is 6.6m/23% longer than the original 737 design!), whereas the A320neo is much, much closer to the original design. The 737 MAX has ~80% parts commonality with the previous-generation 737 NG, yet alone the original 737; the A320neo has 95% with its predecessor, which _is_ the original design.