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United Airlines (IATA code: UA) is a major airline in the United States that has been operating since 1926 and was formerly known as Varney Air Lines. Headquartered in Chicago, Illinois, United Airlines is the world's third-largest airline when measured by revenue, after American Airlines and Delta Air Lines. United operates a large domestic and international route network, with an extensive presence in the Asia-Pacific region. Carrying the slogan "Fly the Friendly Skies," United Airlines wants to provide security, trust, comfort, and hospitality to all passengers. United Airlines mostly rely on the Narita International Airport in Tokyo, Japan as its main airport hub for international flights. Additionally, the airline also relies on the Chicago O'Hare International Airport, Denver International Airport, Houston George Bush Intercontinental Airport, Los Angeles International Airport, Newark Liberty International Airport, San Francisco International Airport, Washington Dulles International Airport, Guam, and A.B. Won Pat International Airport for its domestic flights. Throughout its journey, United Airlines has really proven its commitment to provide quality service to its passengers. United Airlines offers MileagePlus, a frequent flyer program that is divided into several memberships tiers, which are MileagePlus Premier Silver, Premier Gold, Premier Platinum, and Premier 1K. With this program, passengers can earn award miles points to be redeemed for various rewards, such as airline ticket discount with United Airlines and other Star Alliance members, hotel discount, or car rental discount. United Club airport lounge is also available for passengers who need to relax while waiting for their flight departure. United Club provides many facilities, such as WiFi access, as well as dining options such as breakfast menus, snacks, and beverages. For these services, in 2012, United Airlines was awarded Best Airline for North American Travel by Business Traveler Magazine, as well as Best Frequent Flyer Program for MileagePlus, for the ninth year in a row, by Global Traveler Magazine. The achievements continued that in 2016, United Airlines was named as the Best Trans-Pacific Airline by Global Traveler and awarded the Green Cross for Safety Innovation Award from the National Safety Council. Recently in 2017, United Airlines was named Eco-Airline of the Year by Air Transport World and awarded the Special Achievement Awards for Best Innovations by Global Traveler. United Airlines was also recognized with the Best Public Affairs Campaign of the Year, and its CEO, Oscar Munoz, was named Communicator of the Year by PRWeek U.S. In its operation, United Airlines offers flights in four main classes, which are United Economy, United Business, United First, and United Polaris. In general, passengers are allowed one carry-on bag and one personal item to bring onboard. The carry-on bag must not exceed 22 cm x 35 cm x 56 cm, including handles and wheels. Meanwhile, personal items must fit under the seat in front of the passenger’s and may include items such as shoulder bags, purses, laptop bags, or other small items not exceeding 22 cm x 25 cm x 43 cm. However, Basic Economy passengers will only be allowed one personal item. In addition, United Airlines passengers are also entitled to a checked baggage allowance, with the maximum dimension of 62 inches (158 cm), including handles and wheels. Meanwhile, the maximum weight for checked baggage varies based on flight class and the passenger’s MileagePlus status. United Economy passengers and MileagePlus Premier Silver members are allowed a maximum of 23 kg per bag. United Business, United First, and United Polaris passengers, as well as MileagePlus Premier Gold, Platinum, 1K, and Star Alliance Gold members are allowed a maximum of 32 kg per bag. United Business, United First, and United Polaris business class passengers can check up to two bags, while United Polaris first class passengers can check up to three bags. Check-in services are available through United Airlines’ check-in counters and kiosks at airports. United Airlines passengers traveling to certain areas within the United States are required to check-in at least 30 minutes before departure, while international passengers must check-in at least 60 minutes before departure. However, passengers traveling to and from the Marshall Islands and Micronesia are required to check-in at least 90 minutes before departure. As an alternative, passengers can also check-in online via United Airlines official website.

Claimed as the oldest airline in the United States, United Airlines began its history with the name Varney Air Lines, founded by Walter Varney. Leon D. "Lee" Cuddeback, the main pilot in Varney Air Lines, led the air postal service airline with a Swallow biplane from Varney Airlines’ headquarter in Boise, Idaho, to a postal hub located in Pasco, Washington. Cuddeback flew Varney Air Lines’ first flight on 6 April 1926 and returned the next day with 200 pounds of mail. This date then became the day when United Airlines was found. In 1927, aviation pioneer William Boeing founded his airline Boeing Air Transport to operate the San Francisco to Chicago air mail route. In 1929, Boeing formed the United Aircraft and Transport Corporation (UATC), which then set to buy several other airlines, including Varney Air Lines. On 28 March 1931, UATC formed United Air Lines, Inc. as a holding company for its airline subsidiaries. In 1933, the United commenced its operation with the Boeing 247 airliner, which was able to fly a transcontinental flight in 20 hours, making it 50 percent faster than its predecessors. After the passage of the Air Mail Act in 1934, UATC was broken up and all of its airline subsidiaries were merged into United Air Lines. Then in 1961, United merged with Capital Airlines and established its position as the United States’ largest airline. United became the first carrier to operate the Boeing 767 in 1982, and the first airline to introduce the Boeing 777 in its commercial service in 1995. In 1997, United co-founded the Star Alliance along with several other airlines. On 16 April 2010, United resumed merger talks with Continental Airlines, which was initially started in 2008. The airlines finally reached an agreement to combine operations on 2 May 2010. The merged airline would adopt Continental's logo and livery, with Continental's CEO Jeff Smisek serving as the head of the new company. Both airlines planned to begin merging operations in 2011 to form the world's biggest carrier and began operating under a single operating certificate from the FAA on 30 November 2011. On 3 March 2012, United and Continental merged their passenger service systems, frequent-flier programs, and websites, virtually eliminating the Continental brand in the eye of the consumer. After the merger of United and Continental, the airlines changed its slogan into "Let's fly together" in October 2010. However, on 20 September 2013, United announced the return of its slogan, “Fly the Friendly Skies”, which was initially introduced in 1965. Furthermore, United also changed its logo following the merger. In 1973, United Airlines commissioned Saul Bass, a designer, to develop a new logo and livery for United Airlines. The new logo and livery, the "Tulip", featured blue, red, and white colors and tulip patterns formed from the "U" letter. Although the logo underwent several changes over the years, it always depicted a tulip element. However, after the merger with Continental Airlines, the “Tulip” was replaced by Continental Airlines "globe" made by Lippincott Company. Today, United Airlines has grown into the world's third-largest airline when measured by revenue, with an extensive presence in the Asia-Pacific region. United operates out of nine hubs located in Chicago, Denver, Guam, Houston, Los Angeles, Newark, San Francisco, Tokyo and Washington, D.C. Through these hubs, the airline serves flights to 235 domestic destinations in the United States and 136 international destinations in 60 countries across Asia, America, Europe, and Oceania.