Originally Posted by brunos

Most countries. Britain being a notable exceptions, imposed entry restrictions on anyone but citizens/permanent residents from March, possibly April. BA international flights have been "repatriation" flights in either direction, even if not officially called that. By now, most have repositioned and traffic on the few BA international flights in May has dwindled to a trickle, except possibly from the countries last hit by virus like South Asia.
By June, any sane European still in Brazil would have flown back, and Brits would certainly not wait for the 8 June UK quarantine. I can't see how BA can fly a daily GRU from 16 June. By next week they will probably/certainly cancel most BA247.