Earlier quoted context omitted.
> First of all, smaller planes such as the A320 I was going to go all "what do you mean, smaller ??? ... surely you mean the A220", but had to good sense to look it up and you are right, the A320 Neo is actually a tad smaller than, for example, the 737-800. Also lighter. Just carries more passengers a longer distance faster with slightly wider seats. Hmm..
The A320 family actually includes the A319 (smaller) and the A321 (bigger), and the A321 (or A321neo) is quite similar to the 737 you selected: 737-800. Even the 320 is only slightly smaller than the 800; and it is quite bigger than the 700.
The 321neo carries up to 240, even the 737-900 ER is left behind (220), though the 321 is longer than the -900 by quite a bit 44.5m to 42).