Which airline has Continental Airlines parted with?

United Airlines

United Airlines has been the world's largest airline in terms of passenger volume since its merger with former competitor Continental Airlines in 2011. The American companies are based in Chicago in the US state of Illinois. United Airlines currently employs almost 87,000 people and maintains an aircraft fleet of around 701 machines. Alongside the German Lufthansa, she is one of the founding and management members of Star Alliance, the world's leading aviation alliance. The group includes the subsidiary United Express, which offers regional flights, and the cargo airline United Cargo.

The history of United Airlines is closely linked to that of the aircraft manufacturer Boeing. Because in 1929 United was founded by aircraft pioneer William Boeing, who had bought up a number of smaller airlines and merged them into a new company under the name United Airlines. Like all US airlines founded before World War II, United Airlines began as an air mail company; Passenger transport was only added in the course of the 1930s. From 1933 United Airlines was one of the first airlines in the USA to offer continuous domestic flights from coast to coast. This was made possible by the use of Boeing 247 aircraft, the tank volume of which was sufficient to cover such long distances without refueling stops. In 1934, United Airlines was separated from the Boeing Airplane Company by law (Air Mail Act of 1934). After the Second World War, United Airlines - like the entire US aviation industry - experienced a tremendous boom: during the 1950s alone, the number of passenger kilometers flown increased fivefold. Growth continued over the next two decades, but gradually flattened out.
United Airlines was the first airline in the world to use a flight simulator in pilot training in 1954. After the merger with Capital Airlines, United Airlines replaced the previous industry leader American Airlines as the largest airline in the western world in 1961 - at that time only the state-owned Soviet airline Aeroflot was larger. The 1970s turned into a difficult decade for United Airlines: weak economic growth resulted in high losses at times, and the Airline Deregulation Act of 1978, which promoted the unbundling of the industry, increased competition and caused profits to shrink further.

In the 1980s, United Airlines expanded again significantly, not least through the 1985 takeover of PanAm's Pacific business, which was followed in 1991 by the takeover of PanAms connections to London Heathrow Airport. This made United Airlines only one of two US airlines (the other was TWA) that had landing rights at the important London hub before the liberalization of air traffic through the Open Skies Agreement (2008).

In the terrorist attacks on New York and Washington, D.C., on September 11, 2011, two of the four hijacked aircraft were United Airlines aircraft. United Airlines successfully went through bankruptcy proceedings between 2003 and 2005.