I made a new cabin configuration for one of my plane types but the cabin configuration of the existing planes of that type does not change. Is there a way to change the cabin of the existing planes? I cannot change the cabin when changing the flights in the planning.
You created a new cabin configuration and want to assign that to an existing aircraft which is in use already?
Switch to the fleet management, select the aircraft and assign the new cabin by selecting this one below the fleet-table. The new cabin is assigned to that aircraft and all flight which will be available for booking (starting 3 days ahead) will have the new cabin. The old one remains for the still available flights in the reservation system. (Some kind of cheating protection, as you may already have bookings on these flights)