In February 2000, Estafeta Carga Aérea (ECA) was founded as a division of Estafeta. Under concession of the Secretariat of Communications and Transportation of Mexico (Secretaría de Comunicaciones y Transportes) it offers regular cargo and postal services to the public.

With a fleet that comprises 5 Boeing 737 and 2 Bombardier CRJ 100, ECA services 14 air terminals; its 47 ground connections to San Luis Potosí International Airport (AISLP) and 50 more to other airports allow ECA to offer its services in 196 cities.

In February 2002, ECA started offering its airport-to-airport international air cargo services, launching scheduled flights from and to U.S. and connections via third party airlines worldwide. In order to consolidate its services, ECA affiliated to IATA (International Air Transport Association) and settled interlineal agreements.

During the first year of ECA's operations it shipped 9,857 tons of cargo; in 2010, ECA's shipping cargo volume reached 36,247 tons, a figure that positions it among the three major air cargo operators in Mexico.