Thanks for the info. Just booked and ticketed EWR-MIA-GRU-SDU roundtrip $515 in November. GRU-SDU segment is on G3 in Y. Got ticket number, let's hope this sticks.
This is like the 3rd Brazil business fare I bought in the last few months. I flew the UA ORD-GIG fare in January. I also got in on the DL business fare to GRU last year, but might cancel due to all the travel restrictions still around.