Air passenger carriers are entities that transport people from one place to another by air. Some synonyms for the term include airlines, air carriers, air transportation companies, aviation companies, and flight operators. These synonyms are often used interchangeably in the industry and in regulatory contexts. They all refer to organizations that provide air transportation services with varying levels of scope and focus, from regional airlines that serve local areas to international carriers that operate across continents. Whether by air taxi, private jet, or commercial airliner, air passenger carriers provide an essential service that connects people and places around the world.