In order to use quick flights, the aircraft cannot be assigned to any active or scheduled flights. So you'll have to deactivate any routes assigned to the aircraft, cancel the flights, and then you will be able to use quick flights to transfer the aircraft.
Routes will only schedule one at a time, so the way you have that set up with each flight being a separate route, the game will only schedule the first route RDU-BOS. Then once that flight completes, it will schedule the second route, BOS-RDU, and so on. If you had it all set up within one route, then yes, all flights would schedule at once.
Routes will only schedule one at a time, so the way you have that set up with each flight being a separate route, the game will only schedule the first route RDU-BOS. Then once that flight completes, it will schedule the second route, BOS-RDU, and so on. If you had it all set up within one route, then yes, all flights would schedule at once.
I am the developer of Airline Enterprise