You may call the airport ahead of your trip to confirm if they have mail facilities. If they do have, you may still send your knitting needles instead of losing them for good or see them in the airport trash bin. You may want to carry a padded, self-addressed, stamped envelope in case your knitting needles or your other knitting materials are not allowed on the plane. A piece of better advice would be to leave all your knitting valuables at home so you will not be forced to part with them and you can enjoy them for a long time.