[nommm-nommm]

Completely irrelevant. We aren't talking about Germany or driving to other countries, that's totally different. We are talking about travel within one's own country. I would expect rental car companies to limit travel to foreign countries.

[darklajid]

Nice use of 'we' there. I implore you to read the post I specifically replied to once more. That post explicitly talks about crossing country lines.

[nommm-nommm]

We = this article and the commenters on this article. We are commenting on travel between two US states, nothing to do with crossing country lines. The grandparent topic was, specifically, about ground transportion for four Americans from one part of the US to another part of the US.

[mikeash]

Well, this whole subthread is about an American airline operating in the US. (And yes, you can potentially drive a car across an international border from the US!)