Originally Posted by rylan

Doesn't have to be the lowest fare, but if there are only K on the return then the companion search will show nothing.

I looked and the only non-broken fares are K or higher. Some connecting flights show in U/T as a broken fare, meaning one segment of the return is U and the other T... so in effect that is booking as two 1-way fares. You can't have a broken fare with the coach companion cert... so with a connection both segments have to be in the same fare bucket.