United Airlines is about to get more basic.

In an investor call Tuesday, Chicago-based United -- the biggest carrier at Denver International Airport -- was to announce it is adding a new "basic economy" fare to its reservation system.

The new category of fares is designed to appeal to a growing, price-conscious segment of the flying public that has been gravitating to a relatively new type of airline in America — the ultra-low-cost carrier.

Denver-based Frontier Airlines along with Spirit Airlines and Allegiant Air have positioned themselves as aggressive competitors in this ULC category by offering rock-bottom basic fares and then charging add-on fees for everything else from checked bags to seat assignments and snacks and beverages.

Read more at the Denver Business Journal: http://bizj.us/1oy61w

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