I have a question, though....what if the original flight is booked, but the return flight isn't or vice versa. Is the discount going to be applied to the dollar amount for one way? What happens if a flight is not booked on the first leg of the flight, but then at a stop-over airport, it fills up...is the discount forfeited altogether or reduced in some way? (I know y'all probably can't answer these questions, but I wonder if the airlines are really thinking about these things).
And, as has been said, you know the airlines are really hurting...especially, in light of Sept. 11th...so, they are not trying to lose any money "unnecessarily".
I bet all of the people who might be subjected to this policy are probably like

..if it ain't one thing this skinny folks gripin' 'bout, it's another...