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.

Gol and Azul propose to maintain separate brands while coordinating their finances, networks and product offerings.

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.

Azul and Gol shares rose sharply on Thursday, following the announcement of a proposed merger between the two Brazilian airlines. Azul’s stock price rose by more than 4%, while Gol’s shares jumped by about 8%.