Sometimes I think the end-game for transportation is personal transportation pods that get docked into a self-driving-car/subway/train/ferry/airplane system. You'd load up your family pods with your favorite bedding/pillows/devices/books/toys before your trip, wheel them out to the curb, hop inside, and hail a Waymo. The car would arrive, dock with the pods, ferry you to the airport, scan you & your luggage for dangerous items on the way, and then drive straight out to the tarmac to load you into a plane. Plane takes off, gets to its destination, and then a small shuttle-tug drags your pods to the subway. They eventually offramp (without stopping) to another self-driving car, which pops the pods into an elevator and take you straight up to your hotel room. If you're asleep in the pod you could keep sleeping the whole way, otherwise you can unpack and have a real bed there, then hop into a seated family pod for sightseeing the next day.

It's like intermodal containers for people. For short-haul flights it could cut door-to-door travel time by 2/3, since so much of it is taken up by ground transportation, waiting, ticketing, waiting, security, waiting, rental car counters, and more waiting.