Hmm I see
I was looking back and forth between the (both delta) A320 and A321, and it almost seems as if the A321 has a bigger CFM engine in it. I’m aware that they’re both a 56-5B , so perhaps the nacelle is different?
Alternatively, I may need to have my eyesight checked :)
So I solved the mystery actually, so it turns out, all of delta’s A320s (ex Northwest) are rather old, so they all have the CFM56-5A variants. Delta’s A321s are all obviously rather new, and have the more advanced versions of the CFM56-5B engine. And according to wikipedia (https://en.wikipedia.org/wiki/CFM_International_CFM56), The 5B has “a new fan in a longer fan case, and a new low-pressure compressor with a fourth stage (up from three in earlier variants)” In other words, it’s got more stuff inside, making it bigger.
These CFM56-5B engines can produce at most 10,000lbs of thrust more than the CFM56-5A.
And you guys are not wrong either, Most of the newer A320 family aircraft (Including 319 and 318) are built with a variant of the 5B model. I just happened to see an older A320.
Thanks for your help!
The A320 family in IF all have the CFM56-5B engines