Using 'Adjacent Departure Airports'

As London or Scottish Control sectors*, there is the option to choose whether departures from adjacent airports are displayed, by means of a special runway 00 at '000A Show adjacent departure airports' in the Runway Selector dialogue.

Option 1: with a selected runway 00 on the right hand side (under DEP or ARR, or both, doesn't matter): the departure list will show departures from all airports within the sector, or immediately adjacent to it.

Option 2: with no runway 00 selected: the departure list will show departures only from airports for which you have top-down responsibility for TWR services. That is, only when nobody else is covering it.

*(including as an observer, using Alternative Sector Ownership)

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Thanks to Jamie Fox for originally implementing this option, and some of the instructions above.