Originally Posted by
rehoult
Ignoring the above (very valid) answers, there is also the possibly of Y being oversold. If they know they are going to have to op-up people, they will start reducing J inventory to manage the 'net' oversell of the aircraft. But as the people haven't been op-uped yet, there are no seats assigned.
Yes but why wouldn't R >0 in this case? In an oversell AC is better to try and get eUps before OpUps.