[Well, just don't expect Ky to be the same. He may be rich, but he doesn't like spending money.]

They tend to go deep enough underground that it doesn't matter. For example, I can think of three cities off the top of my head divided by rivers, and they all go beneath them with no problem.

And yes, there's something...enjoyable about flying. I don't know if it's because it's always been man's dream to soar among the clouds or not, but when you're in the air, you feel...well, more free.