Both American Airlines and United Airlines have received poor reviews for reasons such as cramped seats, poor service, bad food, delays, and lost luggage. However, the ranking on the list 'Worst Airlines' shows American Airlines at rank 3 and United Airlines at rank 4. The specific reasons for dissatisfaction may vary, but both airlines are considered among the worst by users.

United Airlines is a major American airline headquartered in Chicago, Illinois. It operates a comprehensive domestic and international route network, making it one of the largest airlines in the world. United is a founding member of the Star Alliance, the world's largest airline alliance.

Currently, there are no user-generated pros or cons available for United Airlines. However, general feedback about airlines can vary greatly and may include factors such as the quality of customer service, in-flight amenities, punctuality, and ease of booking.

You can book a flight on United Airlines through their official website, www.united.com. The website allows you to search for flights, compare prices, and complete your booking. You can also book flights via their mobile app or by calling their customer service.

United Airlines offers a variety of services including in-flight entertainment, Wi-Fi, meal options, and different classes of seating such as Economy, Economy Plus, Business, and First Class. They also provide a frequent flyer program called MileagePlus, which allows passengers to earn miles and redeem them for various rewards.

American Airlines is a major American airline headquartered in Fort Worth, Texas. It is one of the largest airlines in the world in terms of fleet size, revenue, and number of destinations served.

Currently, there are no user-generated pros and cons for American Airlines. However, some general pros could include a large network of destinations and frequent flyer programs, while cons might include occasional customer service complaints and flight delays.

American Airlines offers a variety of services including domestic and international flights, frequent flyer programs, in-flight entertainment, and various classes of service such as Economy, Premium Economy, Business, and First Class.

You can book a flight with American Airlines through their official website, mobile app, or by contacting their customer service. You can also book flights through travel agencies and online travel booking platforms.

The AAdvantage program is American Airlines' frequent flyer program. Members can earn miles by flying with American Airlines and its partners, as well as through everyday activities like shopping and dining. These miles can be redeemed for flights, upgrades, and other rewards.