Family of 3 is looking to book 3 First Class roundtrip tickets to Europe through FRA on Lufthansa metal for next summer. I've mostly booked business class, but it feels like availability usually opens up around January for business class in the summer. Any suggestions when to start looking for First class availability? I know it opens up more a week or 2 out but with family going it would be better if booked as far out to make plans.