Here’s my situation I have an aircraft that was flying from point A to B. I then rescheduled the aircraft to fly A to C instead. Problem is that when I did the change over of schedule the last flight is A to B and the first flight of the new route is C to A. So basically I need to be at the computer when A to B is complete to transfer the aircraft to C, otherwise I’m in trouble since my aircraft will be parked at B and will never get to A or C. The problem is that I want to sleep and don’t want to be up to have to transfer the flight which is at some hour in the morning. Why can’t I just have the option to book a transfer flight from B to C at a future time of my choosing rather than having to execute a transfer flight at the current time from the current airport.
You could always cancel both the last flight A-B and the first flight C-A… 
Yes but they’re fully booked. After spending an hour rescheduling flights I needed to take a break, by the time I checked the loads the flights were pretty full. I managed to transfer th a/c from A to C had to cancel one flight.
You need to do this when you initially book the flights, so they don’t fill up first.
Specifically, you need to do this whenever the next "Entering flights into ORS" cycle in the Server Status has taken place, normally every 30 minutes. So, if you have an hour to spend on AS, and want to reschedule, make sure that’s the first thing you do, then before you have to sign out again, you can cancel the relevant flights. It’s what I always did in these cases.
I also think there should be a way to make both an option to select the day and hour for a transfer, and be able to create scheduled transfers or aircraft positioning. They exist in reality so why can’t there be one in AS? they would have some costs but they wouldn’t generate any revenue.