Brazilian carrier Azul SA and the principal shareholder for rival Gol Linhas Aereas Inteligentes SA reached an agreement to work toward a merger, potentially creating one of the largest airlines in Latin America.

Abra—which also controls Colombia’s flag carrier Avianca—and Azul concluded the two Brazilian airlines have 90% complimentary and non-overlapping routes. Last year, amid reports that Azul was interested in merging with its rival GOL, the airlines launched a domestic codeshare.

Abra Group (the majority investor of Gol and Avianca) and Azul signed a non-binding Memorandum of Understanding (MoU) today with the intent to explore a combination of their