I have booked and then later cancelled 2-4-1 redemptions without penalty.... so I guess as long as you arent worried about the credit card refund coming in a statement period after the one in which you paid for the taxes (should the timing cause that).... then....I imagine its the same for award tickets... . I defer to someone who has tried this with award tickets just on the offchance that 2-4-1'a are treated differently...or that I was lucky twice...