DEFINITION:

Under this generic definition we include all the activities related with humanities as, for instance:

• History (the history of aviation has extended over more than two thousand years, from the earliest forms of aviation, kites and attempts at tower jumping, to supersonic, and hypersonic flight by powered, heavier-than-air jets. Experiments with gliders provided the groundwork for heavier-than-air craft, and by the early-20th century, advances in engine technology and aerodynamics made controlled, powered flight possible for the first time. The modern aeroplane with its characteristic tail was established by 1909 and from then on the history of the aeroplane became tied to the development of more and more powerful engines. The first great ships of the air were the rigid dirigible balloons pioneered by Ferdinand von Zeppelin, which soon became synonymous with airships and dominated long-distance flight until the 1930s, when large flying boats became popular. After World War II, the flying boats were in their turn replaced by land planes, and the new and immensely powerful jet engine revolutionised both air travel and military aviation. In the latter part of the 20th century the advent of digital electronics produced great advances in flight instrumentation and «fly-by-wire» systems. The 21st century saw the large-scale use of pilotless drones for military, civilian and leisure use. With digital controls, inherently unstable aircraft such as flying wings became possible).
• Arts, sports, entertainment and recreation, including museums, as well as filming or any other artistic expression.
• Social studies related with aviation.
• Libraries and any database containing relevant data for aviation.

(Source: PAE own elaboration, sector 71 of NAICS and Wikipedia: https://en.wikipedia.org/wiki/History_of_aviation)