Everlasting Comfort Airplane Foot Hammock - Memory Foam Foot Rest for Plane Travel - Portable Foot Rest for Air Travel, Desk & Car - Airplane Essentials Foot Hammock for Plane Travel

I'm 5"8 and find the seating to be OK, though it helps that they're seats are made of a comfier material than other airlines economy class. To make it comfier on the long flight I recommend getting a good neck pillow and foot hammock. I assume you already have a neck pillow so for a foot hammock I recommend this one as it's still sturdy after years of use, helps raise your legs for comfort, and the key feature is the feet separator https://amzn.to/3TFlO5C Enjoy your trip!