Boeing said this work is part of a larger agreement signed in April with Embraer to cooperate in airplane research and technology, including biofuels.
The Brazilian Air Force signed a development contract with Embraer in April for the KC-390.
Boeing has knowledge of potential markets for the KC-390 that Embraer did not consider in its original marketing plan, said Embraer CEO Luiz Carlos Aguiar.
The companies will conduct a joint market assessment for the medium-lift military transport market and analyze business collaboration models.
Founded in 1969, Sao Paolo-based Embraer designs, develops, manufactures and sells aircraft and systems for the aviation, defense and security segments.
The company also has offices China, France, Portugal, Singapore and the U.S.