This article is consistent with my anecdotal experience, where I've noticed high importance placed on travel as a class credential. I grew up in a household that was low income enough that we never vacationed far from home. Now that I'm a white collar software developer on a solid middle class income mixing with middle class folks, mentioning that I've hardly traveled out of the country generates reactions of surprise, to the extent that I often feel I have to explain myself and my lack of overseas travel.