Originally Posted by
aquamarine237
East Asia flights flying 777-300ER are C/Y and F seats are sold as C. These seats are reserved for more expensive tickets. Notably Z fare ticket holders are unlikely to be eligible. I think the OP was in luck because he is flying interncontinental C. Enjoy the F seats!
Thanks for the explanation! I don't really need F seats on a 2,5h flight but it's still cool nonetheless