[cschmid]

I'm not sure if this will actually be an HSR stop, but it would be super convenient for someone living in e.g. Fresno: Instead of having to use a connector flight to SFO, you can just take the train and transfer.

There are formal partnerships between rail providers and airlines around the world, where your train ride is treated like a leg of your flight. You have a guaranteed connection, and often your bag is transferred from the train to your airplane.