this THREAD covers the setup of aircraft for the Basic Game i.e. not using the Advanced Naval Rules.
In the Basic Game the Republicans and the Nationalist both get one B-XIX aircraft unit each at the start of the 1936 scenario. They are both on the map and are the only aircraft until reinforcements are brought on via the playing of cards as Events.
The Ni32 and Ju52 are only used in the Advanced Naval Game.