Originally Posted by
TWA Fan 1
J.: I agree with your interpretation.
You can do SDC within 24 hours of your original flight.
The new flight may not be more than 12 hours earlier or later than the original flight.
Where do you read that? I think it pretty clearly sates that it must depart no more than 12 hours from the
time you make the request.
From CO.com
Inside of this timeframe, you can try to take an alternate flight so long as it departs no more than 12 hours from when you are making the request.
...not many other ways to interpret that...