OK, I'm curious... why is this a cause for termination?
- If J goes out full but not Y, the revenue Y seat would be used and the J listing fails.
- If J is not full but Y is, the airline banks the change fee, the J listing gets used, and one fewer person gets op-up'd or IDB'd.
- If neither J nor Y are full, then the airline banks the change fee (assuming non-refundable Y) and the J listing gets used.
- If both J and Y are full, the J listing fails and the Y ticket is subject to normal oversell procedures.
What am I missing? Does this mess with the revenue management projections somehow?