Looking for some intel and guidance from the FT AA experts...I booked JFK-LAX-SYD in FF. AA just up-gauged equipment on JFK-LAX to a 772, so now I am officially in J class on this leg. Can I still get access to FF Check-In and Chelsea Lounge since my booking was made in FF for both legs, or would I need to switch to one of the flights still operating on a 321T (at least for now)? Thanks in advance for any guidance y'all can offer.

Happy Holidays!