Delta Air Lines (DL, Atlanta Hartsfield Jackson) is set to boost its shareholding in Aeroméxico (AM, México City International) parent firm, Grupo AeroMéxico, with the acquisition of an additional 4.9% stake. Acquired following the divestiture of a group of Mexican investors, Delta also is also reported to have its eye on Citigroup's 16% shareholding in the carrier.

Should that acquisition come to pass, it would take Delta to the maximum permissible shareholding a foreign investor can hold in a Mexican airline.

AeroMéxico and Delta have been collaborated extensively in recent months opening a new heavy Maintenance, Repair & Overhaul (MRO) facility at Querétaro - the largest of its type in Latin America. As part of a Memorandum of Understanding (MOU) and continuation of their commercial alliance signed in 2012, the carriers have also invested equal amounts in the project to move work at Guadalajara and expand MRO capabilities for their own aircraft and other carriers.

Delta has also advised the Mexicans in the development of their México City International hub operations which aims to become a core hub for travel between the Americas as well as Asia.