To follow up on my post above. This is one data point, but at this time, all F seats LAX-BOS on Oct 13 nonstop is sold out. This is on B739, so 20 F seats. Sure, there may be mileage purchase or instrument upgrades, but I'm sure many of the F seats were bought, and there is very little or no chance of CPU.
I found out that there are 5 carriers on this market (AA, DL, UA, VX, B6), four with F. Interesting to see how the market will play out.