This parameter enables transfer type modification in the route builder. If enabled, the user is allowed to change the means of transportation (rental car, flight, bus, train,...).
If not enabled, the connection type is statically defined in the app. For
From Scratch, the default transport type can not be changed.
Template, the defined connection in the Template can not be changed.
Steps to enable/disable Restrict to Major Airports:
Go to Settings
Click on Distribution Channels
Click on your TripBuilder ID
Click on the Planner tab
Enable/Disable Transfer Type Modification
Click Save
Display in the RouteBuilder