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US airline warns of system blackout affecting flight checkin and bookings

Passengers will be unable to cancel flights, book new flights or check-in, make seat selections or upgrades, or view or retrieve boarding passes in the app — Passengers will be unable to cancel flights, book new flights or check-in, make seat selections or upgrades, or view or retrieve boarding passes in the app (Getty/iStock)

United Airlines is undergoing a planned technology upgrade to its flight reservation system on February 4 between 2:30 a.m. and 6 a.m. ET.
During the maintenance window, many of United's web and app services, including online booking, check-in, and flight changes, will be unavailable.
Passengers are advised to complete any necessary bookings, check-ins, or trip amendments, and download or print boarding passes, prior to the outage.
Although flights will operate as normal, passengers checking in at airports should anticipate longer waiting times at counters.
The upgrade involves relocating the booking system from an older data center in North Carolina to a new facility in Chicago, with the aim of improving reliability.

United Airlines warns of a planned system outage — what to know ahead of your flight — In full