The use of aircraft was one of a number of military innovations in the Mexican revolution.
Soon after the revolution broke out, US based exhibition pilots were persuaded to use their aircraft in reconnaissance roles, including, the soon to become famous Frenchman, Roland Garros. The first serious application of airpower was by the Huerta regime, who sent 31 officers to France in 1913 and ordered 20 new Bleriot monoplanes.
Pancho Villa's army used a variety of obsolete types including three Wright Model Bs and two other Wright types. Needless to say models of these are a bit of a challenge and even if they exist, I certainly didn't fancy building them - all those struts! So the compromise is a 1/72 scale die cast model of the Wright Flyer, from the Postage Stamp range.
A Villista innovation was a mobile aerodrome train. It could carry planes on flat cars, together with workshop vans and coaches for ground crew and pilots. They also used planes as bombers, throwing 75mm shells with fins to the ground. I doubt this was particularly effective, but too good not to use in our game!
Finally, some more conventional weaponry for the Federales, in the form of a 75mm gun. I don't think they will need AA guns!