In the sense of the scheduling both origin and destination, this is closer to conventional Dial-a-Ride service ... the advance is providing the service on-call, rather than with (in this county) one to seven days notice and limitations in days of service for some outlying areas.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.

I can imagine that in many places airport shuttle busses work almost the same way - though it is far from standard, and you have to learn the system of each new place. But this is a right analogy to start with. The idea could be (and should be) applied broader and gradually improved. An aggressive promotional/incentive push may cut a lot in carbon emissions, congestion and parking space eventually.