Founded in 1940, which association focuses on aviation business service providers?

The association that focuses on aviation business service providers and was founded in 1940 is indeed the National Air Transportation Association, commonly known as NATA. This organization represents businesses that provide services in the aviation sector, particularly those that contribute to the general aviation community, such as fixed-base operators, maintenance providers, and flight training organizations. NATA works to advocate for the interests of these service providers, promote safety, efficiency, and accessibility in aviation, and provide members with resources and networking opportunities to enhance their operations.

NATCA, the National Air Traffic Controllers Association, primarily represents air traffic controllers and focuses on labor issues for this group. ALPA, the Air Line Pilots Association, is dedicated to representing pilots, addressing issues pertinent to their profession and safety. Airlines for America is an advocacy group for passenger and cargo airlines, focusing on broader airline industry policies rather than specifically servicing business providers. Thus, NATA distinctly serves the niche of aviation business service providers, making it the correct answer.