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

United Airlines is set to upgrade its reservation system on Wednesday, customers urged to be prepared for possible glitches.

United will take its core reservation platform offline as part of a planned controlled restart of its SHARES booking system.

United Airlines is planning a short overnight shutdown of many features on its website and mobile... The post United to Disable App and Website Functions Overnight for Reservation System Upgrade ...

A major airline's bold tech upgrade could leave passengers stranded. Will their plans go smoothly, or will chaos ensue?

United Airlines warns of a planned system outage — what to know ahead of your flight - The update is a modernization of ...