Delta and United Airlines both have negative feedback from users, but the reasons may vary. Delta has been criticized for poor customer service, including incidents where staff behavior has been reported as rude or unprofessional. United Airlines, on the other hand, garners strong negative feelings from users overall, with some expressing extreme dissatisfaction. The choice between the two could depend on which type of bad experience you are more willing to tolerate.

Based on user comments, Delta has received specific complaints about rude and unprofessional behavior from staff. In contrast, United Airlines has a generally bad reputation among users with strong negative sentiments but fewer specific instances detailed. If customer service is your primary concern, you might find Delta's specific issues more concerning.

Currently, there are no user-generated pros and cons for Delta.

Delta is an airline company. According to the description provided, it is noted as 'Because life is a nightmare.' For more information, you can visit their website at delta.com.

Yes, you can request an upgrade on Delta flights. However, it may not always be granted. According to a user comment, asking for an upgrade resulted in a negative experience where they were told they were entitled and ended up crying in economy class.

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.