And on high-demand flights cancelled award tickets often don't go back into the award bucket, but become revenue (and wind up flying empty, if necessary). The high rate of fake/multiple award bookings on high-demand routes is part of the problem with getting F/J trans-pacific availabllity. Of course in 2009 a lot of the patterns have changed as they are giving a lot of seats away (2 for 1 and all sorts of amazing negotiated fares).