I can't find the exact statistics right now, but the quote was that 10% of flyers are paying full fare (down from 16% before). 10% means several tens of millions of passengers per year.
<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by marcuspratt:
NOBODY PAYS FULL FARE ANYMORE, ITS OVER, FAHGETABOUTIT! IT AINT GONNA HAPPEN NO MORE!</font>