Yup, you're right. Not sure why I thought that Y was the class I needed, but I looked it up and it is NHXETNE1. That one provides the free stopover in CLT/PHL and another one in Europe for 100 Euros. I may actually try to work that into my plans too because I'll be flying back out of VCE > PHL > BGM. I'll have to look into it, but I may be able to actually use VCE as my destination and do a stopover in FCO for 100 Euro and fly between the two rather than take the train. I'm not even sure if that's something I'd like to do, but now that I looked at the fare and it's allowed, it's intriguing. haha
Thanks