Headwind Core Rulebook Basic Edition

From the introduction: Welcome to Headwind - the free-spirited aviation RPG. Headwind places you in the cockpit of your very own airplane: typically small, single engine aircraft uniquely adapted to live around the Aspermerian Sea. Modeled after the real-life Adriatic but set in an alternate 1920s - 1940s Earth, the short distances between neighboring countries, cities and harbors have made these practical planes ubiquitous to the region. Pilots use them for everything from basic travel and shipping to sport and sometimes more nefarious activities like piracy and smuggling.