On the PTY-YYZ Route (GW2, currently), the B737-300/400/500 (maximum seating 189) gets a "too small" but the MD-80 series (maximum seating 172) does not.
Is this a bug? If not, why: As I understood, the maximum seating size is what matters regarding the penalty?
As said previously: could someone responsible make an explanation how and when the too small warning appears and what its effect is? These "unreal" rules do have a reason in the game, but it would be nice if everyone could know about how they work.