Originally Posted by
waldo135
The 321 has greater surface area, is stronger and has double slotted trailing flaps that the 320 doesn’t. So…not really the same.
The wing is the same. You are not an engineer are you? Again, just a derivative of the original design. It's not a new airfoil.
That is different than the classic 73 (-100/-200) to the NG wing and MAX wing (MAX and NG are the same, only difference is the tip devices design). They are different airfoils. Different numbers and nomenclature. The 321 wing (airfoil) is not.