LAX-BOS business class $1900
I couldn't say when this change occurred exactly, but I am certain at some point last month there were fares that booked into Z or P; now only a $1900 C is available.
It seems that all the cheaper, -up style business/F fares contain the following restriction
THE FARE COMPONENT MUST NOT INCLUDE TRAVEL BETWEEN BOS AND LAX.
One sees this restriction for the p.s. routes on these and other fares. There have been lie-flats on LAX-BOS for a while; is this a prelude to being classified p.s. / premium transcon?