Originally Posted by
notEnuf
The only thing remotely the same is the nose and egg shape cross section of the 727. The wing tail and most systems have evolved into a completely different airplane from the 737-100 to the max 10.
https://youtu.be/bz1vltQSbMQ?si=bWpjEVhadpVc21uC
The fact that MCAS exists shows that the airframe is obsolete. Boeing needs a new clean sheet aircraft to complete with Airbus.