Originally Posted by number_6

You have to read my posts more closely, I worded it carefully (and did not say you cannot change dates; in my example the change was class of travel on the same airline and date). Of course date changes are allowed (but not routing changes, even to different airline on the same city pair, much less co-terminals). In any case these rules change from time to time, so be sure to explicitly check before issuing the award if it matters to you.