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Originally Posted by
bigwalrus
The stated benefit of Silver is "free seat selection at time of booking".....
Correct. And OP had that benefit at time of booking and that’s where it ends unfortunately.
There is plenty of evidence on the board that confirms advice given by other replies above that the seats selected are likely to disappear when OP is no longer silver, along with all the other silver benefits.
From personal experience, I can confirm the preferential seating for a future flight for a silver card I gifted to a family member disappeared when the silver membership ended, as did all other benefits related to that flight.