The First and Second World War provided boost to the flying industry by investing public money in R&D for building newer war-planes. Thus, the paradox was that even before the public could satiate its desire of flying, it was being used as a killing machine. But the tremendous technological boost made the swift development of the travel industry possible.
Flying was an expensive activity which only a few could afford by buying the airplanes. For those who could not afford their own planes, renting became the only viable option. The airlines were those corporate entities that owned, operated and maintained airplanes for the sake of clients who would pay for passage in the form of tickets. Any other form of ownership or operation was not possible. Thus, the airlines provided many advantages to the clients: it was cost effective; clients were not bothered about flying and maintaining planes; they got effective service without investing in ownership. In essence, it was a win-win situation for both the airlines (which profited by ticket sales), and the clients (who would not have been able to fly otherwise).
Today, various airline services cater to different sectors of passenger clients. While some airlines attract the premium paying clients, some offer no-frill service to low-cost passengers. In some countries only national carriers are allowed to offer flying services; in some countries multiple carriers may ply. In some sectors, route or passenger sharing arrangements have been made between different airlines. Some airlines cater to national travel, some offer international travel. This section is your guide to the world of airlines.