United Airlines is a major United airline with its headquarters Chicago, Illinois. It is the world’s largest airline in terms of number of destinations covered, which was founded on April 6, 1926 as Varney Air Lines and started operating from March 28, 1931. The airline operates scheduled domestic and international services to 375 destinations from its hub main hubs at the United States, Guam, Houston, Tokyo and Chicago. It is a founding member of the Star Alliance and has codeshare agreements with Aer Lingus, Aeromar, Air Dolomiti, Asiana Airlines, Jet Airways, etc.
Passengers could use the United Airlines booking Online Check-in function on the website. Simply input your flight information to sign in online. Web check-in begins 24 hours before travel and ends one hour before departure. Commuters who cannot check in online or need customised attention can do it at the airport or at one of United Airlines' check-in desks. Arrive at least two hours before departure for domestic flights and three hours before departure for international flights to help check-in, baggage drop-off, and luggage drop-off go more smoothly.