Flight Strategy: short haul vs long haul?

Why not mid-haul?

Definition as per the game:
Short haul:
Mid haul:
Long haul:

Short Haul

You can boost short haul passenger demand by increasing the "price attractiveness" characteristic.
This has a maximum impact for routes below ~2000km
[SEE ALSO airline characteristics, staff]

Long Haul

You can boost long haul passenger demand by increasing the "entertainment" characteristic.
This starts to increase your demand from 4000km, but reaches its peak for routes longer than 10,000km and shorter than 14,000km
[SEE ALSO airline characteristics, staff]

Mid Haul
Well, that is the problem about mid haul. These is a large gap between the short haul and long haul that cannot really be maximized.