Originally Posted by
channa
Also when you're looking at such a high fare differential, it may be worth looking at other carriers.
If you're paying a $1,000 upfare, and some other carrier had space for $500, it might make sense to either cancel the ticket (and use any residual credit later), or just trash the ticket.
If this was outbound, missing the segment and buying another ticket on your own would probably have resulted in the remainder of your ticket being cancelled.