GSX seems to have a stubborn pattern of sending a small, perhaps nine-seater, bus to collect 130 passengers from an aircraft.
If you use an airplane that doesn't set the Passenger number itself, what GSX does depends HOW you set GSX to calculate the Passenger number:
- If you have the "Estimate Passenger Number" option Enabled, their number is estimated based on the actual Payload BEFORE calling the bus.
- If you have the "Estimate Passenger Number" option Disabled, their number should always be correct, and the large Bus will appear
If you are using an airplane the DOES set the Passenger number by itself, all the above options will be ignored, and the airplane code will take control of the passenger number.
This means it must be sure the correct number is set BEFORE you called the Passenger bus because, obviously, if the Bus already started *before* the airplane code set it correctly, its model has already being decided, so it's not as if GSX would "destroy" an already-created Bus just because the airplane code set a new Passenger number when it was already on the way.
The Neoplan bus will always appear if the Passenger Number is 18 or higher, since 17 is the maximum capacity of the Passenger Shuttle.