Zayo has found another customer for for the dark fiber in its extensive inventory. A 'major U.S. telecommunications company' has selected the Boulder-based fiber operator for a dark fiber link between the New Orleans, Louisiana and Memphis, Tennesse metro areas.
The route in question is the easternmost one that Zayo acquired in the 360Networks deal in 2011, and therefore requires no additional buildout. It generally follows the eastern bank of the Mississippi north to St. Louis, where it veers northeast to Chicago. They lit it themselves soon after the deal, but of course there's plenty left to lease as dark fiber. In this case, the unnamed customer is taking a 20-year IRU.
Zayo has certainly spent some effort on the north-south routes in the center of the country. One of their intercity dark fiber projects over the last few years was a few hundred miles west between Dallas and Omaha.