ahh people are beginning to catch on to what I'm talking about :-) It can be useful in plenty of cases.

The anomalies seem to happen most often with routes not served by WN.

I couldn't get IAD-DEN-IAD to price out ... but I could get IAD-DEN-DCA to price at .5rr.

If you're reffering to the examples I listed, there was not service scheduled for any of them.

Incidentally these things are of great value to me because I'm a college student and was targeted for triple credit out of ISP for Sept.- Nov. so soon enough I'll have MR'd ISP-BWI 10 times RT yielding 5 RRs and a CP pass for $158 per RR .... so using half of one will essentially get me and my companion to anywhere WN flies Round trip for less than 24hrs for about $40 each.

Not bad!