Originally Posted by
anabolism
I thought there was one that had a Flyer Talk mode (add "/flyertalk" or something to the URL) that allowed this. I can't recall for sure, since it didn't meet my needs (I want a business class ticket if it's cheap and can adjust where I am going from or to and when to get it, and it seemed fixated on cheap coach tickets).
That was likely the FareCompare FlyerTalk site I linked to above. It had its own URL that included the word "flyertalk.html."