The new Regional Transportation District light rail line from downtown Denver to Denver International Airport scored high in a recent ranking of “best airports for transportation.”

But don’t expect the University of Colorado A line to be a big time saver compared with driving to DIA.

The DIA-downtown Denver rail line was ranked No. 4 in the nation in a ranking compiled by MileCards.com, which used four equally rated criteria: Time saved versus driving; cost; frequency; and convenience.

DIA’s transportation…