I had saved a small (250-ml) bottle from an Olympic Airlines flight from Toronto to Athens in order to fill it from a drinking fountain in Athens airport while waiting for a flight to Corfu. As there was a long delay it came in very handy in the overheated boarding lounge. But before we got on the flight to Corfu, security confiscated the empty bottle because it COULD, POTENTIALLY contain more than 100 ml. I asked if they would at least recycle it, but the security guard--tossing it gleefully into the trash--said, we never do that, we just throw them out. We were so teed off by their rudeness, we now travel to Corfu via Germany in order to avoid Athens airport.