United Airlines is set to upgrade its reservation system. Here's what that means for travelers.

February 3, 2026

TL;DR

United Airlines is upgrading its Shares reservation system.
The upgrade involves transferring reservation data to a new facility in Chicago.
An outage is scheduled for Wednesday from 2:30 a.m. to 6 a.m. EDT.
During the outage, web and app services like booking, check-in, and itinerary retrieval will be unavailable.
Passengers flying on Wednesday are advised to check in on Tuesday.
Approximately 600 flights were previously canceled to accommodate the upgrade.
United has rehearsed the data migration and expects minimal disruption.

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