In 2005, ELTRA entered into partnership with SONACA Belgium in Brazil for the manufacturing of small and medium sized part (PESOLA for machined parts and SOPECAERO for sheet metal parts).

Considering the People’s Republic of China’s growing aviation market and the AIRBUS’s A320 Final Assembly Line in Tianjin (PR China), SONACA and ELTRA extended their cooperation in 2009 for the manufacturing, assembly and certification of A320 series Wing Slats in PR China.

In 2012, SINELSON AERO TIANJIN Ltd., the jointly operated SONACA and ELTRA factory, delivered during its first year of activity 280 slats to the Airbus final assembly line. End of 2014, Sonaca became the sole shareholder of Sinelson with a Service Agreement signed with Eltra.