Frontier Airlines ended its service to Aspen in April in a move that cut the number of seats coming into Sardy Field by 16 percent.

The move was a result of Frontier’s $120 million restructuring following the company’s bankruptcy filing in 2008.

For months, Frontier, which lost $90 million in the first quarter of 2011, had been trying to sell its four-plane fleet of Bombardier Q-400 turboprops as part of cost-cutting measures. They are the company’s only aircraft capable of flying into Aspen’s small airport.

As a result of the move, the Aspen/Pitkin County Airport became a one-airline operation during the off-season, with United Airlines as the only option, leading to an increase in airfares.