United Airlines, recognized as one of the major airlines representing the United States, is headquartered in Chicago. It has hubs not only at Chicago O'Hare (ORD) but also in Denver (DEN), San Francisco (SFO), Newark (EWR), and Washington Dulles (IAD).

Looking into the history of United Airlines, its roots actually trace back to 1927 when William E. Boeing founded 'Boeing Air Transport.' In the early days of the airline, it grew by merging with companies like Varney Air Lines and National Air Transport. However, in the 1930s, the 'air mail scandal' occurred, leading to the prohibition of aircraft manufacturers owning airlines starting in 1934. As a result, Boeing's subsidiaries split, with the aircraft manufacturer 'Boeing,' the parts supplier 'United Technologies,' and the airline 'United Airlines' becoming independent entities.

After that, United Airlines grew to be part of the 'Big Four' domestic airlines in the U.S., and in the 1980s, it began to expand its international routes. Starting in 1983, it opened a route from Seattle and Portland to Tokyo, and the following year, it began operating a route from Seattle to Hong Kong. In 1986, it quickly expanded its international routes by acquiring Pan American Airlines' Asia-Pacific routes and Narita slots. By 1990, it had acquired Pan Am's London Heathrow route, and in 1991, it purchased Pan Am's Latin American routes, effectively establishing itself as the 'number one airline in the U.S.'

In 2001, United Airlines faced a major setback when two of its passenger planes were involved in the 9/11 terrorist attacks. Ultimately, on December 9, 2002, it filed for Chapter 11 bankruptcy protection and was on the verge of being completely dismantled. To overcome financial difficulties, it launched the low-cost airline brand 'Ted' in 2003, but it did not achieve the expected results and was merged in 2009. After painful restructuring, it acquired Continental Airlines in 2010, reclaiming its position as the number one airline, surpassing Delta Airlines.

Meanwhile, United Airlines has primarily operated routes connecting the West, Midwest, and Northeast since its founding, resulting in relatively fewer connections to the southern regions. Additionally, an interesting fact! In 1970, Westin Hotels was acquired by United's parent company 'UAL' and became a subsidiary. In 1987, UAL launched a massive project to connect United, Hertz Rent-a-Car, Hilton Hotels, and Westin Hotels through its ticketing system 'Apollo' to create a 'travel conglomerate,' but unfortunately, it completely failed. As a result, Westin Hotels was sold to Japan's Aoki Group, which later transferred its shares to Starwood, ultimately becoming part of the Starwood hotel chain.

United Airlines has established George Bush Intercontinental Airport (IAH) in Houston as its key hub. The most notable feature of the Houston hub is its well-developed routes not only to North America but also to Latin America and the Caribbean. By maximizing the geographical advantages of the southern U.S., it is often used as a layover point when traveling to Mexico or Latin America. Additionally, Houston itself is one of the most populous cities in the U.S., resulting in significant business demand. United Airlines operates both international and domestic flights based on this.

Moreover, Houston Airport generally has relatively low congestion, making transfers convenient. The time taken to move between boarding gates is short, and customs and security checks are relatively quick. Therefore, whether during vacation or business travel seasons, if you have a schedule that involves a layover in Houston, you can leisurely explore the airport.

In summary, while United Airlines has several hubs, George Bush Intercontinental Airport in Houston plays a crucial role as a gateway to the southern U.S. and Latin America. If you are planning to travel or go on a business trip to Mexico, Latin America, or the southern U.S., consider a route that includes a layover in Houston. The convenience of transfers and the variety of routes will be advantageous.