with: Emirates Airline (EK0863, EK0867), Qantas Airways (QF8863, QF8867), Oman Air (WY0601, WY0623), United Airways (Bangladesh) (4H0584, 4H0582)
with: Austrian Airlines (OS0458, OS0452, OS0456), Deutsche Lufthansa (LH6399), American Airlines (AA6497), airberlin (AB5054), British Airways (BA0696), Air Canada (AC6158)
with: Austrian Airlines (OS0458, OS0452, OS0456), Deutsche Lufthansa (LH6399), easyJet (U25359), American Airlines (AA6497), airberlin (AB5054), British Airways (BA0696)
with: Brussels Airlines (SN2050, SN2048, SN2046), US Airways (US5902), Deutsche Lufthansa (LH5605, LH5609), United Airlines (UA9910), Jet Airways (India) (9W6050)
with: Brussels Airlines (SN2064, SN2066), Deutsche Lufthansa (LH5625, LH5627), United Airlines (UA9926), bmi regional (BM1627, BM1629, BM1631)
with: Deutsche Lufthansa (LH5613, LH5611, LH5591), Brussels Airlines (SN2058, SN2056, SN2060), United Airlines (UA9924), Jet Airways (India) (9W6060)
with: Brussels Airlines (SN2184, SN2174, SN2178), Aegean Airlines (A33011, A33012), United Airlines (UA9908), Jet Airways (India) (9W6084), Thai Airways (TG6501)
with: British Airways (BA0404, BA0392, BA0396, BA0388, BA0398), American Airlines (AA6425, AA6427), Japan Airlines (JL7705)
with: Air Canada (AC0849, AC0857, AC0859), Austrian Airlines (OS8225), Egyptair (MS9604), SAS Scandinavian Airlines (SK3885), Deutsche Lufthansa (LH6584), South African Airways (SA7302)
with: Air Transat (TS0293, TS0265, TS0209, TS0479, TS0249, TS0207, TS0247)
with: Air Transat (TS0225, TS0199, TS0183, TS0325, TS0725)
with: Air Canada (AC0849, AC0857, AC0859), Austrian Airlines (OS8225), Egyptair (MS9604), SAS Scandinavian Airlines (SK3885), Deutsche Lufthansa (LH6584), South African Airways (SA7302)
with: American Airlines (AA6344, AA6336), British Airways (BA0734, BA0738, BA0726), Swiss International Air Lines (LX0357, LX0359, LX0349)
with: British Airways (BA0718, BA0712, BA0710, BA0716), American Airlines (AA6565, AA6354), Swiss International Air Lines (LX0327, LX0333)
with: British Airways (BA0718, BA0712, BA8763, BA0710, BA0716), American Airlines (AA6565, AA6354), Swiss International Air Lines (LX0327)
with: British Airways (BA2736, BA2740, BA0734, BA0738), American Airlines (AA6344, AA6336), Swiss International Air Lines (LX0357, LX0359)
with: IBERIA (IB4710), British Airways (BA0155, BA1155), Air Canada (AC6512, AC6510), Egyptair (MS0778, MS0780), United Airlines (UA9858)
with: SAS Scandinavian Airlines (SK0806, SK0804, SK0810, SK0802, SK0812), British Airways (BA0770, BA0762), Japan Airlines (JL7711)
with: SAS Scandinavian Airlines (SK0806, SK0804, SK0810, SK0802, SK0812), British Airways (BA0770, BA0762), Japan Airlines (JL7711)
with: British Airways (BA0850, BA0846), IBERIA (IB7606), American Airlines (AA6385, AA6375), Japan Airlines (JL7799), Polskie Linie Lotnicze LOT (LO0286, LO0282)
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.