In the “real world” Ecuador had a very difficult time procuring effective military aircraft, ending up with a motley collection of Curtiss-Wright sport trainers and eight Meridionali Ro 37bis attack aircraft as their main “combat” element by the late 1930s. After the “real world” border conflict, with Peru in 1941, they attempted to modernize and strengthen their military, but ended up with six sketchily-armed Seversky racers as their main fighter force. Eventually, this was ameliorated by Lend-Lease acquisitions.
In my scenario, they did not purchase Italian equipment, because the threat from Peru was countered by more activist aid from the US. With the build-up of Japanese influence and aircraft in Peru, the government of Ecuador sought to strengthen their military forces to prepare for a potential border conflict with Peru. Other acquisitions will be dealt with forthwith, but for now, let us turn our attention to the Curtiss-Wright CW-21B. Ecuador had a history of Curtiss-Wright purchases, going back to their purchase of CW-14R Ospreys in 1933. To counter the Peruvian build-up, the Ecuadorians required a fast-climbing, maneuverable interceptor aircraft. The Peruvians had been quite happy with the CW-19R ‘Sparrows’ they had purchased in 1936, so they eagerly adopted the powerful interceptor development the CW-21B. Twelve CW-21Bs were ordered in March 1940, with the first delivered in September of that year. At the same time as the initial order, the Ecuadorians asked Curtiss-Wright to develop a floatplane version of the fighter. The first CW-21C flew in August 1940, and six were shipped to Ecuador. Shown below are a CW-21B and a CW-21C of the 1° Escuadrilla de Caza, based at BA Mariscal Sucre.