Southwest, United airlines issue Colorado travel alerts ahead of winter storm

United and Southwest airlines issued travel alerts and offered free rebookings for Colorado travelers on Tuesday ahead of a winter storm set to drop several feet of snow across the region this week. The incoming storm is forecast to bring up to 20 inches of snow to Denver International Airport and up to 4 feet in some areas of the Front Range foothills and mountains, according to the National Weather Service. United Airlines issued a travel alert for airports in Denver, Colorado Springs, Aspen, Vail/Eagle, Gunnison and Steamboat Springs for...