Yes, a new interesting idea!
Player A has finished his/her own flight and then left the plane in front of the gate. And then player B will check the airport and take control of aircraft.
What will it bring to us? We can see many many parked aircrafts that so similar as real life. Details could be changed due to discussions.
Problem: All gates are loaded
Solution: there could be max timeouts for those aircrafts or gate restrictions. And maybe ground Atc can have authority to clean aircrafts which are waiting so longer in front of gates.