Originally Posted by
anabolism
Yes, but there is no need. Prior to ticketing, it can just end wherever.
I routinely book award tickets in this way. I call 330 days out, hopefully grab that flight, and leave it at that. 330 days before the next segment, I call to try and grab that. (The only hassle is that the AAgents have to change the award category each time I add flights. They say they can't book anything without having the proper award category there.)
But don't you run the risk, between the cancellation of the first award and the booking of the second, even if done in seconds, of one or more of the award seats going back into paid buckets (not becoming available again as an award seat)?