Originally Posted by
cyborg
So, to summarize what I learned: You can cancel a return leg of a non-refundable ticket and apply the residual value minus change fee, but it must be for same city pair and fare bucket.
V/r,
-Cyborg
Which again points to the misconception that the original itin has been voided. United adds to this when they say it's a "cancelled" itin. Clearly its remaining value exists only because it is still an open ticket, and subject to the change rules for the original ticket.