Originally Posted by
BusTrav8yrs
Also if one segment clears the GUC is gone.
If you apply a GUC to a multi-segment flight and one segment doesn't clear you still lose the GUC even if it is a much shorter segment.
So if it was a SIN-NRT-JFK flight for example and SIN-NRT cleared and you sat in Y for NRT-JFK your GUC is closed and you don't get it back.
A worse example would be losing a GUC for LAS/SAN-LAX-SYD where only the first segment clears and not the flight to Australia. [I'm not sure whether DL offers FC between SAN and LAX, but it should for at least some of the LAS flights.]