United Airlines is a United States-based global airline with headquarters in Chicago, Illinois. It is one of the largest and oldest airlines in the world, offering national and international flights to various destinations.

You can make a flight reservation with United Airlines through the company's official website, by phone, mobile app or at travel agencies. Simply enter relevant information such as dates, destinations and seat preferences to find available flight options.

United Airlines offers a variety of in-flight services depending on the class of service. This includes meals, beverages, in-flight entertainment, power outlets, Wi-Fi (on select flights and routes) and enhanced comfort in superior classes.

You can check in for your United Airlines flight in several ways: online via the website or mobile app, at airport self-service kiosks, or at the check-in counter. Remember to check check-in requirements in advance to ensure a smooth trip.

United Airlines' loyalty program is called MileagePlus. Members earn miles when they fly with United and its partners and can use those miles to redeem airfare, class upgrades, hotel stays and other exclusive benefits.

Basic Economy is a cheaper fare option offered by United Airlines. It usually has restrictions, such as not allowing access to the overhead bin on the plane and not allowing changes or refunds. Higher fare classes such as Economy, Premium Economy, Business and First Class offer more benefits and flexibility.

If your luggage is lost during a United Airlines flight, it is important to report the problem immediately at the baggage claim desk or through customer service. The company will take steps to locate your baggage and, if necessary, provide compensation in accordance with applicable policies.