I'll be flying to CDG, connecting in LA. The AF site says that OLCI starts 30 hours prior, so when I check in for my first flight will I be able to check in (and check additional seat availability) for the flight to CDG as well (since it will be outside the 30 hour window)?

I want to check in as soon as permitted to have the best chance at switching seats. Our family wasn't able to book seats together

Thanks for any advice