Can we change the plane type just before departure? This is pretty common in real world. Decide on what kind of plane to use based on the number of bookings. I know it indeed increase the programming difficulty. But just an idea. Thanks
At the moment it is not possible to change aircrafts just before departure. It is rather difficult as well because if you some aircrafts even from the same Family have different cruise speeds or need longer for a turn around. Not to mention if you want to change from Prop to Jet aircrafts. As a result you may not find a slot. So for now you can change but it need 3 days before you can see and use a change.
Besides, AirlineSim is a strategic/tactical simulation, not an operational one. It should not be the task of a CEO to re-assign tail numbers in day-to-day operations.