Valid Carrier: This upgrade certificate may be used only on United, United Express or Lufthansa flights (only on multi-cabin aircraft) and not on flights operated by other airlines. Upgrade requests for flights marketed by other airlines but operated by United are only permitted at the airport on the day of travel, subject to availability.
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1a. Lufthansa Standby: This upgrade may be used on a standby basis, subject to availability, on the day of travel on any eligible Lufthansa flight in accordance with the terms and conditions of this certificate, except when booked in LH booking classes X, I, R, N, W, S and E. In addition L and T fares are also excluded for Intra-Europe flights. Please note: This upgrade requires a 14-day advanced notification to Mileage Plus in order to print and mail the certificate for presentation to Lufthansa on the day of departure. Please contact the MPI Service Center to have certificates printed.