Some Emirates tickets have restrictions about when they can be upgraded with Miles – these tickets can only be upgraded with Miles when checking in, including online check-in.
When booking on emirates.com, any itineraries with this restriction will show the message “Check-in reward upgrade only”. When checking in for your flight, you can use your Miles to upgrade (subject to availability) as normal.
Note that this only applies to upgrades with Miles; paid upgrades are unaffected.
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