Starting early Wednesday, United customers won't be able to book flights and access other services as the airline upgrades its reservation system.

United said it would be taking down key online and mobile services for about four and a half hours.

United Airlines has issued a warning to customers and pre-emptively canceled several flights as the airline takes most of its ...

United Airlines is conducting a planned overnight technology upgrade affecting its flight reservation system on Wednesday, February 4, between 1.30am and 5am CST (2.30am and 6am EST/11.30pm February 3 ...

United Airlines passengers are facing a big change beginning Tuesday as the airline shifts how early fliers must check-in for trips. If passengers don't abide by the new rules, United says, their ...

During the maintenance window, many of United's web and app services, including online booking, check-in, and flight changes, ...