1. Go to Aircraft > FleetĀ 

2. To add a restrictive area, Click on "pencil and paper" to edit the tail and go under Geography tab:

3. Under Restricted Areas, you can search per region, country or specific airports code. For example if you want to block all requests from or to Sweden, search for Sweden - country - all airports, this way you will block all airports in Sweden:

Once you have updated your Restricted area click Save.

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