Like its immediate predecessor, the AeC.2, the AeC.3 was an open-cockpit variant of the family, and was distinguished mainly in its use of an Warner Scarab engine.
On 21 January 1936, a refined version flew as the AeC.3G, with an uprated 145 HP Armstrong Siddeley Genet Major engine.
This aircraft first flew as an open-cockpit type, but later had a roof fitted to create an enclosed cabin.
[1] In 1935, Carola Lorenzini set a South American altitude record of 5,500 m (18,040 ft) in an AeC.3, and another aircraft of this type was flown by Santiago Germanó to win the aerobatics prize at the Resistencia air meet the same year.
A final feat for the AeC.3 for 1935 was its use by Pedro B. Mórtola in a long-distance round-trip flight between Buenos Aires and Rio Gallegos, covering 5,200 km (3,200 mi) in 37 hours 20 minutes.