XO Communications will sell its national wireline telecommunications business for $700 million in cash and use the proceeds to become a leading provider of fixed broadband wireless services to businesses and service providers. The company said it has entertained several bids over the past few months for its wireline assets and that the winning bidder was Elk Associates LLC, an entity owned by XO's controlling stockholder, Carl Icahn. XO currently is one of the largest holders of fixed wireless licenses in the 28 GHz-31 GHz spectrum range covering...