[2] Despite its short life as an independent club, Aviación Nacional was champion of the Aragon Regional Championship in 1939, which qualified them for the 1939 Copa del Generalísimo, where it was eliminated in the quarterfinals.

Later, in 1938, the 35th Unit had to move to Zaragoza due to the Spanish Civil War, and the newborn club settled in that city, winning the 1938–39 Aragon Championship, and thus qualifying for the Copa del Generalísimo in 1939, where they got knocked out in the quarterfinals by Sevilla FC 3–4 on aggregate, after having won the first leg 2–0.

[2] By the end of the war, Athletic found itself in a difficult situation because they were lacking a suitable playing field as the Metropolitano had been completely destroyed by the war, lacking players because its squad had been decimated (including the club's star, Monchín Triana, who was shot down), and it accumulated an economic deficit that envisaged a dark future in its sporting and financial horizon.

[2] The directors of Athletic de Madrid, Cesáreo Galindez and Juan Tourón proposed to Captain Bosmediano and Lieutenant Salamanca, an agreement that could benefit everyone.

Aviación required to impose its name, its shield, the colors of its uniform, and 50% of the directors and the president, and those demands did not convince Athletic either, since they did not want to lose their hallmarks.

[5] Fearing this possibility, Athletic succumb to the conditions and a pre-agreement was reached in September 1939, and so, on 4 October, the representatives of both sides signed the absorption agreements and appoint the first Board of Directors with Commander Francisco Vives Camino as president of the now Athletic-Aviation Club.

[9] In 1940–41, the Copa Presidente Federación Castellana was disputed by the champion and runner-up of the last Central Regional Championship, the 1939 Mancomunado, who were Athletic-Aviation Club and Real Madrid respectively.