FlyerTalk Forums - View Single Post - EVA - How quickly do canceled seats become available?
Old Sep 30, 2015 | 6:46 pm
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exwannabe
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AFAIK, seat reservations free up immediately when changed via the web seat selection. If you have some flight that is wide open, give it a try.

If OTOH, you cancel with the reserved seat, I have no idea.

But you could change out of the good seats just before rebooking, then grab them once rebooked. Only a few minutes risk.
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