Iberia was founded on June 28, 1927, and flew its first route, Madrid to Barcelona, that December. It became Spain's flag carrier, the airline that represents the country abroad. The state took it into the INI holding company in 1939. In 1946 Iberia became the first airline to link Europe and South America after World War II. A DC-4 flew the new route from Madrid to Buenos Aires.
That route set the course for everything after it. DC-8s and later 747s arrived, and Madrid-Barajas grew into the main doorway between Europe and Latin America. Iberia joined the oneworld alliance in 1999. An alliance is a group of airlines that connect their flights. The company was sold to private owners in 2001. In 2011 it merged with British Airways to form International Airlines Group, keeping its own name.
Iberia Express started in 2012 to feed Madrid cheaply, while sister airline Vueling works from Barcelona. A hard rebuild in the 2010s turned Iberia from a steady loss-maker into one of IAG's most profitable parts. It has often topped European punctuality rankings. New Airbus A350-900s and A330s renewed its long-haul fleet. It still leads the Europe to Latin America market by capacity, or seats offered.