For fun, I just got prices for taking my family to Tucson from Portland, a trip we took last week by airplane. It was relatively expensive from what I'm used to for a trip between two cities on the same end of the country, about $2500 total. Nonstop, just under 3 hours flight time. Amtrak would be about half that for a coach ticket. But as you point out, a coach ticket for a 40-45 hour trip is impractical. So I picked a family room (when possible, which was not on every segment). $7000. HAHAHAHAHAHA. I could waste money on first class plane tickets and still pay less than half that.