Plane makers Boeing Co. and Embraer SA are discussing a "potential combination of their businesses," the companies said on Thursday, in a move that could consolidate a global passenger jet duopoly.

Embraer's shares soared around 30 percent in Sao Paulo on the joint statement released in Brazil, which did not give details of how a potential tie-up would be structured. Boeing shares were down 0.7 percent.

The news, first reported in the Wall Street Journal, comes just two months after Boeing rival Airbus SE agreed to buy a majority stake in Bombardier Inc.'s CSeries jetliner program, a direct rival of Embraer's biggest E-Jets.