Commercial airlines are companies that provide air transportation services to passengers and cargo. They operate scheduled flights on specific routes, connecting cities and countries around the world. These airlines use large aircraft, such as those manufactured by Boeing and Airbus, to accommodate hundreds of travelers at a time. Passengers can book tickets through airline websites or travel agencies, and they often have options for different classes of service, such as economy, business, and first class. Commercial airlines play a crucial role in global travel, facilitating tourism, business, and cultural exchange among people from diverse backgrounds.