Help me out here guys. I like to use OnAir company to provide “jobs”. All was going well until they recently implemented a seat class addition whereby you can only transport passengers if your aircraft meets the needed passenger requirement (economy, business or first class). Unfortunately, OnAir seems to think the luxurious TBM930 only has economy seats and so suddenly I’m ruled out of flying most passenger jobs. 
How does OnAir determine this? Is there a setting somewhere in the aircraft’s files that stipulates how many seats and their class somewhere? Perhaps I can edit something.
Go to the maintenance tab for the TBM and change the seat types.
It’s up to OnAir. MSFS does not differentiate seats by type.
Aaah I see now. I can change my 5 economy seats for 3 first class seats. That’ll have to do I guess. Thanks @tallyshark.