with: Air Canada (AC6198, AC6186, AC6200), Austrian Airlines (OS452, OS458), United Airlines (UA9846), Japan Airlines (JL7729), British Airways (BA706)
with: Air Canada (AC6198, AC6186, AC6200), Austrian Airlines (OS452, OS458), United Airlines (UA9846), Japan Airlines (JL7729), British Airways (BA706)
with: Brussels Airlines (SN2048, SN2050), Deutsche Lufthansa (LH5555, LH5609), ANA All Nippon Airways (NH5128), bmi regional (BM6048, BM6050), Etihad Airways (EY7230)
with: Brussels Airlines (SN2064, SN2066), Deutsche Lufthansa (LH5625, LH5627), ANA All Nippon Airways (NH5138), bmi regional (BM6064, BM6066), Hainan Airlines (HU8570)
with: bmi regional (BM6058, BM6056, BM6060, BM2001), Brussels Airlines (SN2056, SN2058, SN2060), United Airlines (UA9888)
with: Brussels Airlines (SN2174, SN2184, SN2178), ANA All Nippon Airways (NH5162), Air Canada (AC6373), bmi regional (BM6178), Aegean Airlines (A33011), Hainan Airlines (HU8557)
with: British Airways (BA404, BA398, BA396, BA392), Japan Airlines (JL7705, JL6527, JL7769), American Airlines (AA6425)
with: Air Canada (AC849, AC859, AC857), Finnair (AY5999), British Airways (BA99), Iberia (IB7341), Ethiopian Airlines (ET1140), American Airlines (AA6213)
with: Air Transat (TS565, TS265, TS293, TS209), Air Canada (AC1931), Deutsche Lufthansa (LH6716), Brussels Airlines (SN9629), United Airlines (UA8253)
with: Westjet (WS31), Air Transat (TS725, TS225, TS183, TS325, TS525), Air Canada (AC1939), Deutsche Lufthansa (LH6746)
with: Westjet (WS4), Emirates Airline (EK4719), Air Canada (AC849, AC859, AC857), Finnair (AY5999), British Airways (BA99), Iberia (IB7341)
with: British Airways (BA738, BA730, BA728, BA724, BA736), LATAM Chile (LA5571, LA5561), Japan Airlines (JL7707)
with: British Airways (BA716, BA718, BA710, BA712), LATAM Chile (LA5580), American Airlines (AA6565, AA6354), Japan Airlines (JL6533)
with: Iberia (IB7368), British Airways (BA155), Air Canada (AC6512, AC6510), Egyptair (MS778, MS780), TAP Air Portugal (TP7017), United Airlines (UA7718)
with: British Airways (BA716, BA718, BA710, BA712), LATAM Chile (LA5580), American Airlines (AA6565, AA6354), Japan Airlines (JL6533)
with: British Airways (BA738, BA730, BA728, BA724, BA2736, BA736), LATAM Chile (LA5571), Japan Airlines (JL7707)
with: Singapore Airlines (SQ2149, SQ2145), Deutsche Lufthansa (LH959, LH955, LH953), United Airlines (UA9569, UA9562), ANA All Nippon Airways (NH5868)
with: British Airways (BA912, BA902, BA916, BA904, BA910), Japan Airlines (JL7873, JL7821), American Airlines (AA6498)
with: British Airways (BA960, BA956, BA948, BA952, BA954), Cathay Pacific Airways (CX7163), American Airlines (AA6386), Japan Airlines (JL7713)
with: Deutsche Lufthansa (LH943, LH947, LH949), United Airlines (UA9549), Austrian Airlines (OS7366, OS7374), ANA All Nippon Airways (NH5866), South African Airways (SA7507)
History
United Airlines has its roots in the Varney Air Lines air mail service of Walter Varney. In 1926 the airline flew the first schedule airline service in the country's history.
During the September 11, 2001 terrorist attacks, two of hijacked airplanes were United Airlines aircraft. An airline industry slump, coupled with economic hardship, increasing oil prices, and higher labor costs, led to the company losing $2.14 billion in 2001.
In 2011 United merged with Continental Airlines.