OK

Using Multi-City function, going BUF-DTW-LAX on 08/17/2010 flight 3131 to flight 1619 I get a Q class available but every time I try to book it it tells me that class is not available.

Using One-Way function going BUF-DTW-LAX on 08/17/2010 it only gives me H class available.

Decent size price difference here.

Same thing happening going back from LAX-ATL-BUF getting the same problem with availability showing then disappearing.