Sounds good. I did 36 hours with DD2 at that age (UK to NZ via LA).
I'd make sure to bring loads more formula than you expect you'll need. DD2 was breastfed, but she switched back to newborn style feeding for the duration so was constantly feeding.
I always bring a couple of extra t-shirts when I travel with DDs. One change of clothes always seems like tempting fate - once they're on, you can't have another accident
I once came off a 1 & half hour flight with both DDs due to various accidents & spillages: DD1 was wearing my t-shirt as a dress, I was wearing my second spare t-shirt, DD2 was in her 3rd outfit. Only DH was still in the clothes he had started in
Oh, and layers for the baby. I found the temperatures on the plane seemed to fluctuate a lot so I was always taking off/ putting on layers.
Lastly, I always pack a pashmina type thing. Works as a shawl, a blanket, a mat for baby to lie on during stopovers. Once even used it as a makeshift sling, not to take the weight of then-toddler DD1 completely, just to spread the load a bit!