Not in this case no. Simply means J and D classes are closed for sale. No waitlist, no sale. Dragging things from the back of the memory banks here, but IIRC, each flight number (any carrier) is created with a set "profile". Aircraft type, amount of seats to be sold in each class and fare bucket, overbooking profile, seat classes, meal type etc etc. In the above instance I'm guessing the flight flight number some days has Biz and some days doesn't (until there are enough all Y 733's in the fleet to cover set rotations every time the flight operates), so it's profile will still keep a J and C class in it. Once there are enough all Y 733's to cover the flight number every time it is used, the "profile" for that flight will change to starting it's fare classes at Y in the readout and J and D won't appear as there is never any J or D to be offered on the flight number. Would be too difficult for the systems to have two profiles for one flight number, and I'd imagine a lot of fluffing around to keep changing the profile daily and making sure the right profile is in for the respective day, so far easier to just close out C and J class when it's not offered on a particular day until they are no longer needed.