This is why looking at the current number of aviation passengers on these routes that's often the most valuable thing. It shows where people think the time savi

This is why looking at the current number of aviation passengers on these routes that's often the most valuable thing. It shows where people think the time savings justify hiring a car/taking taxis. Clearly not having overheads of airport security will probably reduce the minimum distance required for this, but as a first pass it's good data source.