Assuming you are intending to go by Reserve a Delta Flight Without Paying and need to require trips to be postponed for as long as 24 hours then this is fairly precarious, especially when the flight tickets are reserved on the web. Notwithstanding, there are still a few manners by which you require the trips to briefly wait. It tends to be for ordinary (no-grant) trips as well concerning grant flights (flights paid for with miles). We should find out what a Delta Reservation Agent needs to say about this.