FreshDirect has figured out an important trick: how to make money delivering groceries.

Brick-and-mortar retailers that have seen their businesses upended, and some literally destroyed, by the rise of e-commerce finally had a moment of vindication last week: The U.S. Supreme Court, in a landmark 5-4 ruling, basically gives states the green light to have online retailers collect sales tax just like any local retailer.

A vague mention of Amazon.com Inc’s interest in any sector might be enough to send investors into a tizzy, but the top executive of U.S. Xpress Enterprises Inc. is unperturbed.