I was discussing ideas with my friend in Singapore, Vanessa, and she suggested to me how the disruption of flights because of the volcano eruption in Iceland was similar to a 404 error. Should we suppose that flights are website links and airports are websites (situated worldwide, just like the internet), cancelled flights would thus be 'broken' or 'forbidden' links, and thus a 404 error.
I developed my idea as a pseudo-point and click adventure, although the only real interactive element in it is that...um, it has mouseovers, and that the structure of your journey is not totally linear (but not by much). The only outcome available is that your flight, being cancelled, proves your trip to the airport fruitless. Sigh.