Flying 16 July from BOS to GRU. Opted to connect through ORD as there were more C seats available at time of booking (traveling on D fare booked into Y for which I will request FFCC thanks to FT). When I check for C availability on seatcounter, I now see C0 from ORD to GRU when starting in BOS; C0 from ORD to GRU when starting in ORD; and C4 from ORD to GRU when starting in SFO.

Any thoughts?