The deal announced at the Paris Air Show Tuesday is between Boeing, which will lead in selling, sustaining and training crews for the aircraft, and the plane's manufacturer, Embraer.
The companies say sales will focus on the United States, Britain and select Middle Eastern countries.
"The KC-390 is an extremely capable aircraft that continues to attract interest by several nations, and Boeing's military transport expertise is ideal for teaming in the international market," said Luiz Carlos Aguiar, president and chief executive officer of Embraer Defesa & Seguranca. "This agreement strengthens the level of cooperation between both companies and the defense industries of Brazil and the United States."
The KC-390 started as a program for the Brazilian air force in 2009. The aircraft features advanced performance, cargo and capacity capabilities.It is believed the initial potential market for KC-390 is for 700 aircraft.
The aircraft is still under development and has completed its critical design review.