Frontier Airlines has a new partnership with Canopy Airport Parking in Commerce City, Colo. Customers of Denver International Airport who are Frontier EarlyReturns members can not only earn 100 bonus miles for using the parking service, but will also receive discounted parking rates and a free upgrade to the next class of parking at Canopy if you are a Frontier Summit member or a Classic Plus ticket holder. Canopy is an eco-friendly company that provides continuous shuttle service between their lot and Frontier ticket counters using their biodiesel and hybrid shuttles from a parking facility utilizing an array of green technologies including solar, geothermal and wind power. The cost per day is $9 for open air parking, $14 for covered self-serve and $18 for indoor valet parking. Visit http://www.CanopyAirportParking.com to learn more.