InterCity Airport Demand

This happens because the demand calculation within game does not take into account when airports are near each other. It looks at distance and the passenger numbers at each and works demand from there.

so is it able to be corrected?

Helicopter airlines fly this route. or did.

Look at the route between the two Shanghai airports. therre is a big suprise there

As moldy has hinted at, the game works out demand on individual routes based upon the total passenger figures that we enter into a database for each individual airport. It would be impossible to include route data on every single possible route in game.

The script that calculates demand on each route is far from perfect and we hope to include modifiers to improve demand on inter-island, inter-city or "remote" routes where air travel is prominent.

As such, this is not really a bug that can be fixed, more a feature request.

ok

it would be nice if the script could be overridden on some routes to input custom demand data, would be very useful for quickfixing little bugs like that, and to make sure that demand is properly distributed, say a route that in RL has low to 0 demand has some pretty good demand in AE, a quick fix could fix the demand issue and allow demand to be properly distributed to other airports

but this would be a mere override and not require inputting data for every single route.

To be fair, airlines used to operate SFO-OAK and MIA-FLL.

In more recent years, UA used to fly SNA/BUR/ONT-LAX.

Just as a humble idea to your marvellous work: you could add a traffic reducer gain which acts like nuclear force for hadrons, indipendently from data: very big, nearly constant reduction of traffic within 100 miles or so, exponentially decreasing for farther locations. IE, making so no one would fly between Malpensa/Linate/Orio al Serio (or between Ciampino and Fiumicino, or Kiev's airports etc.). I think it'd just need some tuning.