Any engine-driven vehicle meant to fly would fall under this skill. You likely have a pilot's license, meaning you can fly any helicopter or small plane. You can perform a lot of stunts safely and can fly very close to the ground if this skill is quite high. You understand the radio lingo used to co-ordinate planes and can follow air-traffic laws. You cannot handle any large aircraft to seat over a dozen people without Heavy Machinery.
Likely in future settings, piloting crafts outside an atmosphere requires Spaceflight.