Aspen, CO – Skiers and riders flying into Aspen this winter will have to do so on United Airlines, as both Delta and Frontier have announced plans to end their service to the Colorado ski resort town.

Frontier officials announced their decision to leave Aspen at the end of September to employees on Wednesday, part of new owner Republic Airlines’ decision to phase out Frontier’s fleet of Bombardier Q400 turbo-prop aircraft that the airline uses on its route from its Denver hub to Aspen-Pitkin County Airport.

Delta Air Lines officials had earlier advised the ski company of their decision to abandon the airport before ski season begins. Delta had been flying one non-stop daily from its hubs in both Salt Lake City and Atlanta.

United carried the lion’s share of air travelers to Aspen last winter, with 19 daily flights on its United Express subsidiary from Denver, Los Angeles, San Francisco and Chicago. With the reduced competition, tourism officials anticipate that fares into Aspen will rise this winter and visitation to the storied ski resort town will drop. Unless United boosts its service, available seats into Aspen will drop from 196,000 to 140,000 with the departure of both Frontier and Delta.