I tested it: I gave the airline only the option to buy A319's.
50% of the aircraft it bought were A319's, the other 50% were aircraft meant for long haul flights.
So I guess it's kind of working.
You can put it in the preferred aircraft list.
At some point we'll make an option for the airline to be a little more strict with the list.
Probably when we're redoing the AI.
Edit: Upon second look, it doesn't work that well when you have more than 1 preferred airliner.
You can still put it in this list, we'll make sure it works.
50% of the aircraft it bought were A319's, the other 50% were aircraft meant for long haul flights.
So I guess it's kind of working.
You can put it in the preferred aircraft list.
At some point we'll make an option for the airline to be a little more strict with the list.
Probably when we're redoing the AI.
Edit: Upon second look, it doesn't work that well when you have more than 1 preferred airliner.
You can still put it in this list, we'll make sure it works.