Aircraft Maintenance & Engineering Corporation (Ameco) is a joint venture between Air China Limited (Air China) and Lufthansa German Airlines (Lufthansa), with 75% shareholding by Air China and 25% shareholding by Lufthansa. It is one of the largest aircraft engineering service providers in the Asia-Pacific region, and is devoted to becoming an international aircraft engineering technology service provider. Ameco is authorized by CAAC to act as a Designated Modification Design Organization Representative (DMDOR). Currently, it possesses maintenance licenses from almost 30 countries or regions, including FAA, EASA and CAAC. It has more than 200 maintenance stations at home and abroad, forming a large maintenance network worldwide.