A KIN airport is used where a base has two airport that are close, but where crew need to check out from the originating airport.
Crew will require a ground transport to go back to the originating airport.
The system will generate a legality warning that a transport is missing, the warning is not as hard as a station conflict. Worst case scenario is that crew can take a taxi back to the Check In airport.
On the roster it is indicated with a blue line and a warning (default color)
The color can be customised from the setup parameter "GanttColors"