IAG, or International Airlines Group, is a major airline holding company formed in 2011. It was created through the merger of British Airways and Iberia, the flag carriers of the United Kingdom and Spain, respectively. IAG operates several well-known airlines, including Aer Lingus, Vueling, and British Airways, serving millions of passengers worldwide. The company is headquartered in London and is one of the largest airline groups in Europe. IAG focuses on providing a range of travel services, from budget to premium options, ensuring that travelers have various choices for their journeys.