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An airline can be defined as a company that offers regular services for transporting passengers or goods via the air. These companies are said to make up the airline industry, which is also regarded as a sub-sector of the aviation sector and the wider travel industry.

The airline industry encompasses a wide range of businesses, called airlines, which offer air transport services for paying customers or business partners. These air transport services are provided for both human travelers and cargo, and are most commonly offered via jets.

Airlines are often grouped into different categories and precise definitions can vary in different parts of the world. However, broadly speaking, airlines can be separated into three main types, International Airlines, National Airlines, and Regional Airlines.

There are a huge number of airlines around the world, each with different ways of doing business. Nevertheless, most can be categorized as belonging to one of the four main business models, which are Full-Service Carriers, Low-Cost Carriers, Charter Airlines and Cargo Airlines.

When it comes to identifying the largest airlines in the world, one of the most widely utilized metrics is revenue passenger-kilometers (RPKs) and this information is published each year by the International Air Transport Association (IATA). As the name indicates, this metric is the sum total of the distances flown by each of the airline’s paying passengers over the course of a year. With this in mind, the biggest airline companies in the world today are: American Airlines, Delta, United, Emirates, Southwest, China Southern Airlines, Ryan Air, KLM.

Airlines that are operating in Bangladesh are Air Arabia (G9), Air India (AI), Air Asia (AK), Biman (BG), China Eastern Airlines (MU), China Southern Airlines (CZ), Cathay Dragon (CX), Druk Air (KB), Emirates (EK), Flydubai (FZ), Etihad (EY), Gulf Air (GF), Himalaya Airlines (H9) , IndiGo (6E), Jazeera (J9), Kuwait Airways (KU), Malaysia Airlines (MH), Malindo Air (OD), Maldivian (Q2), Qatar Airways (QR), Salam Air (OV), SpiceJet (SG), Saudi Arabian Airlines (SV), Singapore Airlines (SQ), Sri Lankan Airways (UL), Thai Airways International (TG), Thai Lion (SL), Turkish Airlines (TK), Vistara (UK).

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