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United Airlines is the world's third-largest carrier as measured by both revenue and by passenger-miles flown.

United enjoyed a run as the world’s biggest carrier following its 2010 merger with Continental Airlines, but has since been eclipsed by both American and by Delta.

Headquartered in Chicago, United and its regional affiliates fly more than 1,200 aircraft through seven hub cities on the U.S. mainland. The company also counts Guam and Tokyo Narita as hub airports.

United traces its history back to 1926, when a mail carrier operation that would become today’s United flew its first flight under the name Varney Air Lines.

This century, United helped shakeup the landscape of the U.S. aviation industry when it merged with Continental Airlines.

Check out the photo gallery above for a snapshot look at today’s United, or scroll down for a by-the-numbers look.

Headquarters: Chicago, Ill.

CEO: Oscar Munoz

Destinations: About 340 in 54 countries

Hubs: Chicago O’Hare, Denver, Guam, Houston George Bush Intercontinental, Los Angeles, Newark Liberty, San Francisco, Tokyo Narita and Washington Dulles.

Daily departures: About 4,500

Frequent-flier program: MileagePlus

Frequent-flier alliance: Star Alliance

Busiest airports (by passengers. 2016)

1. Chicago O'Hare (16.5 million)

2. Houston Bush Intercontinental (15.5 million)

3. Newark Liberty (13.8 million)

4. Denver (11.6 million)

5. San Francisco (10.9 million)

6. Washington Dulles (6.6 million)

7. Los Angeles (5.6 million)

8. Boston (1.9 million)

9. Orlando (1.8 million)

10. Las Vegas (1.8 million)

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Busiest airports (by departures, 2016)

1. Chicago O'Hare (181,488)

2. Houston Bush Intercontinental (178,019)

3. Newark Liberty (139,924)

4. Denver (128,869)

5. San Francisco (91,727)

6. Washington Dulles (74,965)

7. Los Angeles (43,336)

8. Cleveland (16,289)

9. Boston (14,244)

10. Las Vegas (12,680)

Fleet breakdown (as of Dec. 31 2016; includes regional affiliates that fly as United Express)

Boeing 747-400 (20)

Boeing 777-200/300 (76)

Boeing 787-8 (12)

Boeing 787-9 (18)

Boeing 767-300/400 (51)

Boeing 757-200/300 (77)

Boeing 737-700/800/900 (325)

Airbus A319 (61)

Airbus A320 (97)

Bombardier Q300 (5)

Bombardier Q200 (16)

Embraer ERJ 145 (183)

Embraer ERJ 135 (5)

Bombardier CRJ-200 (50)

Bombardier CRJ-700 (79)

Embraer E170 (38)

Embraer E175 (118)

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IN PICTURES: United launches first international route on 'stretch' Dreamliner

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FIRST LOOK: United's new Polaris business class cabin

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