[icc97]

At the moment there's lots of time wasted walking to some gate at the far end of a massive airport. There's only one company here and one or two flights that go straight up and don't need to taxi. So the travel time in the boat won't be much more than the walk from the terminal to the gate.

[internetionals]

Possibly, but decreasing the flight time still won't take much out of the equation that would make it a net win against normal aircrafts.

That's not saying there is no market for something like this, but for anything but the longest flights it's going to be a very specific kind of customer.