Buddy has a family emergency in Europe so I booked him a flight tomorrow with his infant ... easier and cheaper to book 2 seats instead of a lap infant due to the 10% of fare rule. Flying EWR-FRA on the new 777-3 with new Polaris. Anyone know if the seats are allowed to have an infant seat in them?? If so, is there a style limitation (e.g., bucket vs convertible seat). Infant is 8 months. TIA for any thoughts and best seating options -- side by side or tandem, etc.