Thanks to a year-old partnership, if you want to buy a ticket from American Airlines to go beyond their destinations in Brazil you’ll generally fly to South America on American and connect to your final destination on Gol. One passenger tried to fly Gol to
São Paulo, connecting to American Airlines on an American Airlines ticket, and wound up in a confrontation with police in the middle of Gol’s ticketing office in São Luís.
Gol first insisted the U.S. citizen required a Green Card to travel to the United States, and then that American Airlines had Covid-19 test requirements that differed from the CDC’s. In the end though it was flying on an American Airlines codeshare that really fouled things up.