United is upgrading its computers. Here's how that could impact travelers.

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

United to disable app and website for system upgrade

United Airlines will disable many of its app and website functions between 2:30 a.m. and 6:00 a.m. Wednesday morning for an ...
Airways

United Plans Overnight Reservation System Outage

United will take its core reservation platform offline as part of a planned controlled restart of its SHARES booking system.
The Daily Dive on MSN

United to disable app and website functions overnight for reservation system upgrade

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 ...