The aerospace sector is one of the largest sectors in the United States, providing products and services to the military aircraft, missile, space, commercial airline, and general aviation markets.

Airlines are technically part of the Aviation industry, which is a primary sub-sector of the broader Aerospace industry. The term "Aerospace" typically encompasses the entire ecosystem of atmospheric and space flight, including the research, design, manufacturing, and operation of aircraft and spacecraft. While companies like Boeing and Airbus (the manufacturers) are the core of the "aerospace manufacturing" sector, airlines are the "operators" within that same economic cluster. In 2026, the distinction is often blurred because airlines work directly with aerospace engineers to develop "sustainable aviation fuels" (SAF) and next-generation efficient engines. Thus, while an airline's daily business is service and logistics, they are a vital component of the aerospace industry because they provide the demand and operational data that drive the engineering and manufacturing of all modern flight technology.