Locks are labelled TSA 001-007 near the keyway. P assengers use a three or four-digit code, so they are dual-action locks: key unlock for TSA, and combination unlock for the consumer.

Instructions for zipper locks: Turn the dials to the original combination, 0-0-0. Remove the zipper pullers from the lock. Use a pointed object, such as a ballpoint pen or an unfolded paper clip ...