If your flight is cancelled, the airline should in theory rebook you. Another thought is that I highly recommend not booking your air to get in the same day as your cruise. Get there at least a day early. We always do this, and have never used Celebrity Air. I work for an airline. For cruises, we always pay for the tickets. We are arriving two days early into FLL, so no reason to be concerned. Got a better deal booking direct over Celebrity Air. Just my two cents.