To enable POI categories at the front end booking form go to Dashboard > Settings > General settings > Show Categories drop down: Yes (In the Fixed fare routes section).
Point of interest categories can be created in advance at Dashboard > POI Categories section, pre-created categories are: Airports, Cruise ports, Hotels, Landmarks, Towns and Train stations but you can always add more.
Note: POI Categories eg. Airport, Post code, Station will only be shown if there is a Published Fixed fare route that contains a point of interest assigned to that POI Category. This feature hides selection options that are not active so the users are not confused with No car (empty) results.