“A modification has been made . . .” message. Some tickets, including many that have been upgraded with a Global Premier Upgrade, Regional Premier Upgrade or a Mileage Upgrade Award may display the message, “A modification has been made to your itinerary. Please contact United Reservations to have your ticket reissued.”

UPDATE as of 9:45a CT, March 4. If you're traveling today or tomorrow, we recommend calling us to have your reservation updated. If you're traveling in the future we're still working on a resolution for this and will keep you posted.

Shannon; Had a Y class flight automatically upgraded to F as a 1K. Got the "modification" message yesterday. Message is gone today but so are the 125% base miles for Y and the 150% PQM's! Now says I will earn 0.