City based demand - political and land/sea border effects?

[fark24]

After reviewing the manual entry regarding city based demand (link: https://www.airwaysim.com/game/Manual/Routes/Demand/ ) I am a bit unclear regarding what situations the effect is allowed or not allowed to cross national borders.

In the manual, the effect is detailed for several cities in Finland. In the domestic example (Kemi & Oulu), the demand is shared when they overlap. In the international examples Kemi can pull demand from Sweden but Helsinki cannot pull demand from Tallinn.

There is also mention that political situations (such as overlap between the Soviet Union and democratic countries) prevent shared demand. But that this changes after the collapse of the Soviet Union.


Regarding the manual examples:

- Does Helsinki not draw demand from Tallinn because it is/was a part of the Soviet Union or because there is a sea barrier between them?

- Does Kemi get to draw demand from Sweden because they are both democratic countries or because they are connected by land?


Regarding some hypothetical examples (assuming a 200km catchment radius):

- Does HNL draw demand from OGG (domestic, on separate islands)?

- Does YYZ draw demand from BUF (international, historically cooperative governments, land border)?

- Does DOH draw demand from BAH (international, historically cooperative governments, sea border)?

- Does HKG draw demand from CAN (land connection, political transition)? If so, does it occur before or after this pair becomes domestic?

- Does AMS draw demand from DUS (land connection, international with political union)? If so, does it occur before or after they both join the EU?


I'm most interested in the principles that will govern these types of scenarios. And what, if any, exemptions will exist.

[Sami]

All of the cross border travel data is not yet done. But we can have there a factor of catchment probability (i.e 70% of passengers would be willing to cross the border) and several items for two countries based on year (before some political changes and after, for example).

But Helsinki does not take any demand from Tallinn because of the sea. If we look at east Finland vs. Soviet Union, it is also blocked but after it becomes Russia a small percentage of demand can be captured across the border.

In north the Kemi example has a full capture from Sweden too since there are no travel restrictions.