Got this in the inbox today:

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Our final FREE seat sale of 2003 starts at midnight tonight

1 million seats for Free, just pay the taxes and charges

Free seats are available on almost every route with free seats available
every day on 30 routes but book early as weekend availability is limited.
Bookings only on http://www.ryanair.com No call centre bookings available

Free flights from the UK and Ireland only, see website for details.
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How can they afford to do this? Volume?